/*

 * 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.

 *

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package org.graalvm.compiler.core.test;

import jdk.vm.ci.meta.ResolvedJavaMethod;

import org.junit.Test;

import org.graalvm.compiler.nodes.StructuredGraph;

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

import org.graalvm.compiler.nodes.java.MonitorExitNode;

import org.graalvm.compiler.nodes.java.RawMonitorEnterNode;

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

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

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

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

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

import org.graalvm.compiler.phases.common.inlining.InliningPhase;

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

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

public class LockEliminationTest extends GraalCompilerTest {

    static class A {

        int value;

        public synchronized int getValue() {

            return value;

        }

    }

    static int field1;

    static int field2;

    public static void testSynchronizedSnippet(A x, A y) {

        synchronized (x) {

            field1 = x.value;

        }

        synchronized (x) {

            field2 = y.value;

        }

    }

    @Test

    public void testLock() {

        test("testSynchronizedSnippet", new A(), new A());

        StructuredGraph graph = getGraph("testSynchronizedSnippet");

        new CanonicalizerPhase().apply(graph, new PhaseContext(getProviders()));

        new LockEliminationPhase().apply(graph);

        assertDeepEquals(1, graph.getNodes().filter(RawMonitorEnterNode.class).count());

        assertDeepEquals(1, graph.getNodes().filter(MonitorExitNode.class).count());

    }

    public static void testSynchronizedMethodSnippet(A x) {

        int value1 = x.getValue();

        int value2 = x.getValue();

        field1 = value1;

        field2 = value2;

    }

    @Test

    public void testSynchronizedMethod() {

        test("testSynchronizedMethodSnippet", new A());

        StructuredGraph graph = getGraph("testSynchronizedMethodSnippet");

        new CanonicalizerPhase().apply(graph, new PhaseContext(getProviders()));

        new LockEliminationPhase().apply(graph);

        assertDeepEquals(1, graph.getNodes().filter(RawMonitorEnterNode.class).count());

        assertDeepEquals(1, graph.getNodes().filter(MonitorExitNode.class).count());

    }

    private StructuredGraph getGraph(String snippet) {

        ResolvedJavaMethod method = getResolvedJavaMethod(snippet);

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

        HighTierContext context = getDefaultHighTierContext();

        new CanonicalizerPhase().apply(graph, context);

        new InliningPhase(new CanonicalizerPhase()).apply(graph, context);

        new CanonicalizerPhase().apply(graph, context);

        new DeadCodeEliminationPhase().apply(graph);

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

        new LockEliminationPhase().apply(graph);

        return graph;

    }

}