/*

 * Copyright (c) 2011, 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

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

package org.graalvm.compiler.core.test;

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

import org.graalvm.compiler.debug.DebugContext;

import org.graalvm.compiler.debug.DebugDumpScope;

import org.graalvm.compiler.nodes.DeoptimizeNode;

import org.graalvm.compiler.nodes.StructuredGraph;

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

import org.graalvm.compiler.nodes.memory.ReadNode;

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

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

import org.graalvm.compiler.phases.OptimisticOptimizations;

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

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

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

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

import org.graalvm.compiler.phases.tiers.MidTierContext;

import org.junit.Assert;

import org.junit.Ignore;

import org.junit.Test;

/**

 * Tests that the hub access and the null check are folded.

 */

public class ImplicitNullCheckTest extends GraphScheduleTest {

    public static final class Receiver {

        public int a;

    }

    public static int test1Snippet(Object o) {

        if (GraalDirectives.guardingNonNull(o) instanceof Receiver) {

            return 42;

        }

        return 0;

    }

    @Ignore("temporarily disable until LoadHub lowering is clarified")

    @Test

    public void test1() {

        test("test1Snippet");

    }

    @SuppressWarnings("try")

    private void test(final String snippet) {

        DebugContext debug = getDebugContext();

        try (DebugContext.Scope s = debug.scope("FloatingReadTest", new DebugDumpScope(snippet))) {

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

            CoreProviders context = getProviders();

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

            new FloatingReadPhase().apply(graph);

            MidTierContext midTierContext = new MidTierContext(getProviders(), getTargetProvider(), OptimisticOptimizations.ALL, graph.getProfilingInfo());

            new GuardLoweringPhase().apply(graph, midTierContext);

            Assert.assertEquals(0, graph.getNodes(DeoptimizeNode.TYPE).count());

            Assert.assertTrue(graph.getNodes().filter(ReadNode.class).first().canNullCheck());

        } catch (Throwable e) {

            throw debug.handle(e);

        }

    }

}