RedefineInterfaceCall.java

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/*
 * @test
 * @bug 8174962 8010319
 * @summary Redefine class with interface method call
 * @requires vm.jvmti
 * @library /test/lib
 * @modules java.base/jdk.internal.misc
 * @modules java.compiler
 *          java.instrument
 *          jdk.jartool/sun.tools.jar
 * @run main RedefineClassHelper
 * @run main/othervm -javaagent:redefineagent.jar -Xlog:redefine+class+update*=trace RedefineInterfaceCall
 */

import static jdk.test.lib.Asserts.assertEquals;

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

// package access top-level class to avoid problem with RedefineClassHelper
// and nested types.
class RedefineInterfaceCall_C implements I2 {
    public int test(I2 i) {
        return i.m(); // invokeinterface cpCacheEntry
    }
}

public class RedefineInterfaceCall {

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

    static String newC =
        "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 {
        RedefineInterfaceCall_C c = new RedefineInterfaceCall_C();

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

        RedefineClassHelper.redefineClass(RedefineInterfaceCall_C.class, newC);

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

        RedefineClassHelper.redefineClass(I1.class, newI1);

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

        RedefineClassHelper.redefineClass(RedefineInterfaceCall_C.class, newC);

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