/*
 * Copyright (c) 2011, 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.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 */
package com.oracle.graal.compiler.test;

import java.util.*;

import org.junit.*;

import com.oracle.graal.api.code.*;
import com.oracle.graal.debug.*;
import com.oracle.graal.nodes.*;
import com.oracle.graal.nodes.extended.*;
import com.oracle.graal.phases.*;
import com.oracle.graal.phases.PhasePlan.PhasePosition;
import com.oracle.graal.phases.common.*;

public class IfBoxingEliminationTest extends GraalCompilerTest {

    private static final String REFERENCE_SNIPPET = "referenceSnippet";

    public static int referenceSnippet(int a) {
        int result;
        if (a < 0) {
            result = 1;
        } else {
            result = 2;
        }
        return result;
    }

    public static Integer boxedInteger() {
        return 1;
    }

    public static Object boxedObject() {
        return 2;
    }

    @Test
    public void test1() {
        test("test1Snippet");
    }

    public static int test1Snippet(int a) {
        Integer result;
        if (a < 0) {
            result = boxedInteger();
        } else {
            result = (Integer) boxedObject();
        }
        return result;
    }

    private void test(final String snippet) {
        Debug.scope("IfBoxingEliminationTest", new DebugDumpScope(snippet), new Runnable() {

            @Override
            public void run() {
                StructuredGraph graph = parse(snippet);
                BoxingMethodPool pool = new BoxingMethodPool(runtime());
                IdentifyBoxingPhase identifyBoxingPhase = new IdentifyBoxingPhase(pool);
                PhasePlan phasePlan = getDefaultPhasePlan();
                phasePlan.addPhase(PhasePosition.AFTER_PARSING, identifyBoxingPhase);
                phasePlan.addPhase(PhasePosition.AFTER_PARSING, new PhiStampPhase());
                identifyBoxingPhase.apply(graph);
                Collection<Invoke> hints = new ArrayList<>();
                for (Invoke invoke : graph.getInvokes()) {
                    hints.add(invoke);
                }

                Assumptions assumptions = new Assumptions(false);
                new InliningPhase(null, runtime(), hints, assumptions, null, phasePlan, OptimisticOptimizations.ALL).apply(graph);
                new CanonicalizerPhase(null, runtime(), assumptions).apply(graph);
                new PhiStampPhase().apply(graph);
                new CanonicalizerPhase(null, runtime(), assumptions).apply(graph);
                Debug.dump(graph, "Graph");
                new BoxingEliminationPhase(runtime()).apply(graph);
                Debug.dump(graph, "Graph");
                new ExpandBoxingNodesPhase(pool).apply(graph);
                new CanonicalizerPhase(null, runtime(), assumptions).apply(graph);
                new CanonicalizerPhase(null, runtime(), assumptions).apply(graph);
                new DeadCodeEliminationPhase().apply(graph);
                StructuredGraph referenceGraph = parse(REFERENCE_SNIPPET);
                new CanonicalizerPhase(null, runtime(), assumptions).apply(referenceGraph);
                new DeadCodeEliminationPhase().apply(referenceGraph);

                assertEquals(referenceGraph, graph);
            }
        });
    }
}