test/jdk/java/lang/invoke/condy/CondyInterfaceWithOverpassMethods.java

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/*
 * @test
 * @bug 8186046
 * @summary Test for an interface using condy with default overpass methods
 * @library /lib/testlibrary/bytecode
 * @build jdk.experimental.bytecode.BasicClassBuilder
 * @run testng CondyInterfaceWithOverpassMethods
 * @run testng/othervm -XX:+UnlockDiagnosticVMOptions -XX:UseBootstrapCallInfo=3 CondyInterfaceWithOverpassMethods
 */

import jdk.experimental.bytecode.BasicClassBuilder;
import jdk.experimental.bytecode.Flag;
import jdk.experimental.bytecode.TypedCodeBuilder;
import org.testng.annotations.BeforeClass;
import org.testng.annotations.Test;

import java.lang.invoke.MethodHandles;
import java.lang.invoke.MethodType;

@Test
public class CondyInterfaceWithOverpassMethods {
    interface A {
        int a();

        default int x() {
            return 1;
        }
    }


    // Generated class with methods containing condy ldc
    Class<?> gc;

    public static Object bsm(MethodHandles.Lookup l, String name, Class<?> type) {
        return name;
    }

    @BeforeClass
    public void generateClass() throws Exception {
//        interface B extends A {
//            // Overpass for method A.a
//
//            default void y() {
//                // ldc to Dynamic
//            }
//        }
        Class<?> thisClass = CondyInterfaceWithOverpassMethods.class;

        String genClassName = thisClass.getSimpleName() + "$Code";
        String bsmClassName = thisClass.getCanonicalName().replace('.', '/');
        String bsmMethodName = "bsm";
        String bsmDescriptor = MethodType.methodType(Object.class, MethodHandles.Lookup.class,
                                                     String.class, Class.class).toMethodDescriptorString();

        byte[] byteArray = new BasicClassBuilder(genClassName, 55, 0)
                .withFlags(Flag.ACC_INTERFACE, Flag.ACC_ABSTRACT)
                .withSuperclass("java/lang/Object")
                .withSuperinterface(thisClass.getCanonicalName().replace('.', '/') + "$" + A.class.getSimpleName())
                .withMethod("y", "()Ljava/lang/String;", M ->
                        M.withFlags(Flag.ACC_PUBLIC)
                                .withCode(TypedCodeBuilder::new, C ->
                                        C.ldc("String", "Ljava/lang/String;", bsmClassName, bsmMethodName, bsmDescriptor,
                                              S -> {})
                                                .areturn()
                                ))
                .build();

        gc = MethodHandles.lookup().defineClass(byteArray);
    }

    @Test
    public void testClass() throws Exception {
        // Trigger initialization
        Class.forName(gc.getName());
    }
}