RedefineInterfaceCall.java

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/*
 * @test
 * @bug 8174962
 * @summary Redefine class with interface method call
 * @library /testlibrary
 * @build RedefineClassHelper
 * @run main RedefineClassHelper
 * @run main/othervm -javaagent:redefineagent.jar -XX:TraceRedefineClasses=3174407 RedefineInterfaceCall
 */

import static com.oracle.java.testlibrary.Asserts.assertEquals;

interface I1 { default int m() { return 0; } }
interface I2 extends I1 {}

public class RedefineInterfaceCall {

    public static class C implements I2 {
        public int test(I2 i) {
            return i.m(); // invokeinterface cpCacheEntry
        }
    }

    static String newI1 =
      "interface I1 { default int m() { return 1; } }";

    static String newC =
        "public class RedefineInterfaceCall$C implements I2 { " +
        "  public int test(I2 i) { " +
        "    return i.m(); " +
        "  } " +
        "} ";

    static int test(I2 i) {
        return i.m(); // invokeinterface cpCacheEntry
    }

    public static void main(String[] args) throws Exception {
        C c = new C();

        assertEquals(test(c),   0);
        assertEquals(c.test(c), 0);

        RedefineClassHelper.redefineClass(C.class, newC);

        assertEquals(c.test(c), 0);

        RedefineClassHelper.redefineClass(I1.class, newI1);

        assertEquals(test(c),   1);
        assertEquals(c.test(c), 1);

        RedefineClassHelper.redefineClass(C.class, newC);

        assertEquals(c.test(c), 1);
    }
}