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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

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package org.graalvm.compiler.hotspot.test;

import org.graalvm.compiler.core.common.GraalOptions;

import org.graalvm.compiler.hotspot.GraalHotSpotVMConfig;

import org.graalvm.compiler.hotspot.nodes.aot.InitializeKlassNode;

import org.graalvm.compiler.hotspot.nodes.aot.LoadConstantIndirectlyNode;

import org.graalvm.compiler.hotspot.nodes.aot.ResolveConstantNode;

import org.graalvm.compiler.hotspot.phases.LoadJavaMirrorWithKlassPhase;

import org.graalvm.compiler.hotspot.phases.aot.EliminateRedundantInitializationPhase;

import org.graalvm.compiler.hotspot.phases.aot.ReplaceConstantNodesPhase;

import org.graalvm.compiler.nodes.StructuredGraph;

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

import org.graalvm.compiler.nodes.graphbuilderconf.GraphBuilderConfiguration.Plugins;

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

import org.graalvm.compiler.options.OptionValues;

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

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

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

import org.junit.Assert;

import org.junit.Test;

public class ReplaceConstantNodesPhaseTest extends HotSpotGraalCompilerTest {

    private final GraalHotSpotVMConfig config = runtime().getVMConfig();

    @Override

    protected Plugins getDefaultGraphBuilderPlugins() {

        Plugins plugins = super.getDefaultGraphBuilderPlugins();

        return plugins;

    }

    public static class X {

        public static int x;

        public static int y;

        public static int z;

        public static Object o;

    }

    public static class Y extends X {

        public static int a;

        public static int b;

    }

    public static int a;

    public static void assignFields() {

        X.x = 1;

        X.y = 2;

        X.z = 3;

    }

    public static void assignFieldsInBranches(boolean x) {

        if (x) {

            X.y = 1;

        } else {

            X.z = 2;

        }

    }

    public static void assignFieldsWithDominatingInit(boolean x) {

        X.x = 1;

        if (x) {

            X.y = 2;

        } else {

            X.z = 3;

        }

    }

    public static void assignString() {

        X.o = "foo";

    }

    public static void assignToParentAndChild() {

        Y.a = 1;

        X.x = 2;

    }

    public static void assignToThis() {

        a = 1;

    }

    public static void assignFieldsWithDominatingInitOfParent(boolean x) {

        Y.a = 1;

        if (x) {

            X.y = 2;

        } else {

            X.z = 3;

        }

        Y.b = 4;

    }

    private void test(String name, int expectedInits, int expectedResolves, int expectedLoads) {

        StructuredGraph graph = parseEager(name, AllowAssumptions.NO, new OptionValues(getInitialOptions(), GraalOptions.GeneratePIC, true));

        HighTierContext highTierContext = getDefaultHighTierContext();

        CanonicalizerPhase canonicalizer = new CanonicalizerPhase();

        new EliminateRedundantInitializationPhase().apply(graph, highTierContext);

        new LoweringPhase(canonicalizer, LoweringTool.StandardLoweringStage.HIGH_TIER).apply(graph, highTierContext);

        new LoadJavaMirrorWithKlassPhase(config).apply(graph, highTierContext);

        new ReplaceConstantNodesPhase(false).apply(graph, highTierContext);

        Assert.assertEquals(expectedInits, graph.getNodes().filter(InitializeKlassNode.class).count());

        Assert.assertEquals(expectedResolves, graph.getNodes().filter(ResolveConstantNode.class).count());

        Assert.assertEquals(expectedLoads, graph.getNodes().filter(LoadConstantIndirectlyNode.class).count());

    }

    @Test

    public void test1() {

        test("assignFields", 1, 0, 0);

    }

    @Test

    public void test2() {

        test("assignFieldsWithDominatingInit", 1, 0, 0);

    }

    @Test

    public void test3() {

        test("assignString", 1, 1, 0);

    }

    @Test

    public void test4() {

        test("assignToParentAndChild", 1, 1, 0);

    }

    @Test

    public void test5() {

        test("assignToThis", 0, 0, 1);

    }

    @Test

    public void test6() {

        test("assignFieldsWithDominatingInitOfParent", 1, 1, 0);

    }

    @Test

    public void test7() {

        test("assignFieldsInBranches", 2, 1, 0);

    }

}