/*

 * Copyright (c) 2012, 2019, 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.loop.phases;

import org.graalvm.compiler.debug.DebugContext;

import org.graalvm.compiler.loop.LoopEx;

import org.graalvm.compiler.loop.LoopPolicies;

import org.graalvm.compiler.loop.LoopsData;

import org.graalvm.compiler.nodes.StructuredGraph;

import org.graalvm.compiler.nodes.spi.CoreProviders;

public class LoopPeelingPhase extends LoopPhase<LoopPolicies> {

    public LoopPeelingPhase(LoopPolicies policies) {

        super(policies);

    }

    @Override

    @SuppressWarnings("try")

    protected void run(StructuredGraph graph, CoreProviders context) {

        DebugContext debug = graph.getDebug();

        if (graph.hasLoops()) {

            LoopsData data = new LoopsData(graph);

            try (DebugContext.Scope s = debug.scope("peeling", data.getCFG())) {

                for (LoopEx loop : data.outerFirst()) {

                    if (getPolicies().shouldPeel(loop, data.getCFG(), context.getMetaAccess())) {

                        debug.log("Peeling %s", loop);

                        LoopTransformations.peel(loop);

                        debug.dump(DebugContext.DETAILED_LEVEL, graph, "Peeling %s", loop);

                    }

                }

                data.deleteUnusedNodes();

            } catch (Throwable t) {

                throw debug.handle(t);

            }

        }

    }

    @Override

    public float codeSizeIncrease() {

        return 5.0f;

    }

}