test/hotspot/jtreg/compiler/jvmci/jdk.vm.ci.runtime.test/src/jdk/vm/ci/runtime/test/TestSingleImplementor.java

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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/**
 * @test
 * @bug 8238190
 * @summary Verify single interface implementor recording supports diamond-shaped class hierarchies
 * @requires vm.jvmci
 * @library ../../../../../
 * @modules java.base/jdk.internal.reflect
 *          jdk.internal.vm.ci/jdk.vm.ci.meta
 *          jdk.internal.vm.ci/jdk.vm.ci.runtime
 *          jdk.internal.vm.ci/jdk.vm.ci.common
 *          java.base/jdk.internal.misc
 * @run junit/othervm -XX:+UnlockExperimentalVMOptions -XX:+EnableJVMCI -XX:-UseJVMCICompiler jdk.vm.ci.runtime.test.TestSingleImplementor
 */

package jdk.vm.ci.runtime.test;

import org.junit.Assert;
import org.junit.Test;

import jdk.vm.ci.meta.ResolvedJavaType;


public class TestSingleImplementor extends TypeUniverse {

    static int SideEffect;

    interface I {
        void foo();
    }

    interface I1 extends I {
    }

    interface I2 extends I {
    }

    static class Impl implements I1, I2 {
        @Override
        public void foo() {
            SideEffect = 42;
        }
    }

    public static void snippetDiamond(I i) {
        i.foo();
    }

    @Test
    public void testDiamondShape() throws Throwable {
        snippetDiamond(new Impl());
        ResolvedJavaType interfaceType = metaAccess.lookupJavaType(I.class);
        ResolvedJavaType implementationType = metaAccess.lookupJavaType(Impl.class);
        Assert.assertEquals(implementationType, interfaceType.getSingleImplementor());
    }

    interface IF1 {
        void foo();
    }

    static class Impl1 implements IF1 {
        @Override
        public void foo() {
            SideEffect = 43;
        }
    }

    public static void snippetRegular(IF1 i) {
        i.foo();
    }

    @Test
    public void testRegularShape() throws Throwable {
        snippetRegular(new Impl1());
        ResolvedJavaType interfaceType = metaAccess.lookupJavaType(IF1.class);
        ResolvedJavaType implementationType = metaAccess.lookupJavaType(Impl1.class);
        Assert.assertEquals(implementationType, interfaceType.getSingleImplementor());
    }

}