/*

 * 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.

 *

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package org.graalvm.compiler.core.test;

import org.graalvm.compiler.debug.DebugContext;

import org.graalvm.compiler.debug.DebugDumpScope;

import org.graalvm.compiler.graph.Node;

import org.graalvm.compiler.nodes.ReturnNode;

import org.graalvm.compiler.nodes.StructuredGraph;

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

import org.graalvm.compiler.nodes.extended.MonitorExit;

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

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.FloatingReadPhase;

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

import org.junit.Assert;

import org.junit.Test;

public class FloatingReadTest extends GraphScheduleTest {

    public static class Container {

        public int a;

    }

    public static void changeField(Container c) {

        c.a = 0xcafebabe;

    }

    public static synchronized int test1Snippet() {

        Container c = new Container();

        return c.a;

    }

    @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);

            CoreProviders context = getProviders();

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

            new FloatingReadPhase().apply(graph);

            ReturnNode returnNode = null;

            MonitorExit monitorexit = null;

            for (Node n : graph.getNodes()) {

                if (n instanceof ReturnNode) {

                    assert returnNode == null;

                    returnNode = (ReturnNode) n;

                } else if (n instanceof MonitorExit) {

                    monitorexit = (MonitorExit) n;

                }

            }

            debug.dump(DebugContext.BASIC_LEVEL, graph, "After lowering");

            Assert.assertNotNull(returnNode);

            Assert.assertNotNull(monitorexit);

            Assert.assertTrue(returnNode.result() instanceof FloatingReadNode);

            FloatingReadNode read = (FloatingReadNode) returnNode.result();

            assertOrderedAfterSchedule(graph, read, (Node) monitorexit);

        } catch (Throwable e) {

            throw debug.handle(e);

        }

    }

}