/*

 * Copyright (c) 2015, 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.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

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 */

package org.graalvm.compiler.core.test;

import org.graalvm.compiler.api.directives.GraalDirectives;

import org.graalvm.compiler.nodes.GuardNode;

import org.graalvm.compiler.nodes.StructuredGraph;

import org.graalvm.compiler.nodes.StructuredGraph.AllowAssumptions;

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

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

import org.graalvm.compiler.phases.common.CanonicalizerPhase;

import org.graalvm.compiler.phases.common.ConditionalEliminationPhase;

import org.graalvm.compiler.phases.common.LoweringPhase;

import org.junit.Assert;

import org.junit.Test;

/**

 * This test checks the combined action of

 * {@link org.graalvm.compiler.phases.common.ConditionalEliminationPhase} and

 * {@link org.graalvm.compiler.phases.common.LoweringPhase}. The lowering phase needs to introduce

 * the null checks at the correct places for the dominator conditional elimination phase to pick

 * them up.

 */

public class ConditionalEliminationTest10 extends ConditionalEliminationTestBase {

    private static boolean condition1;

    private static boolean condition2;

    private static class TestClass {

        int x;

    }

    @SuppressWarnings("all")

    public static int testSnippet1(TestClass t) {

        int result = 0;

        if (condition1) {

            GraalDirectives.controlFlowAnchor();

            result = t.x;

        }

        GraalDirectives.controlFlowAnchor();

        return result + t.x;

    }

    @Test

    public void test1() {

        test("testSnippet1", 1);

    }

    @SuppressWarnings("all")

    public static int testSnippet2(TestClass t) {

        int result = 0;

        if (condition1) {

            GraalDirectives.controlFlowAnchor();

            result = t.x;

        } else {

            GraalDirectives.controlFlowAnchor();

            result = t.x;

        }

        if (condition2) {

            result = t.x;

            GraalDirectives.controlFlowAnchor();

        }

        return result;

    }

    @Test

    public void test2() {

        test("testSnippet2", 1);

    }

    private void test(String snippet, int guardCount) {

        StructuredGraph graph = parseEager(snippet, AllowAssumptions.YES);

        CoreProviders context = getProviders();

        new LoweringPhase(new CanonicalizerPhase(), LoweringTool.StandardLoweringStage.HIGH_TIER).apply(graph, context);

        new ConditionalEliminationPhase(true).apply(graph, context);

        Assert.assertEquals(guardCount, graph.getNodes().filter(GuardNode.class).count());

    }

}