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 /java/lang/invoke/common
 * @build test.java.lang.invoke.lib.InstructionHelper
 * @run testng CondyInterfaceWithOverpassMethods
 * @run testng/othervm -XX:+UnlockDiagnosticVMOptions -XX:UseBootstrapCallInfo=3 CondyInterfaceWithOverpassMethods
 */

import java.lang.classfile.ClassFile;
import org.testng.annotations.BeforeClass;
import org.testng.annotations.Test;
import test.java.lang.invoke.lib.InstructionHelper;

import java.lang.constant.*;
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.descriptorString();
        String bsmMethodName = "bsm";
        String bsmDescriptor = MethodType.methodType(Object.class, MethodHandles.Lookup.class,
                String.class, Class.class).toMethodDescriptorString();

        byte[] byteArray = ClassFile.of().build(ClassDesc.of(genClassName), classBuilder -> classBuilder
                .withFlags(ClassFile.ACC_INTERFACE + ClassFile.ACC_ABSTRACT)
                .withSuperclass(ConstantDescs.CD_Object)
                .withInterfaceSymbols(InstructionHelper.classDesc(A.class))
                .withMethod("y", MethodTypeDesc.of(ConstantDescs.CD_String), ClassFile.ACC_PUBLIC, methodBuilder -> methodBuilder
                        .withCode(codeBuilder -> codeBuilder
                                .ldc(DynamicConstantDesc.ofNamed(
                                                MethodHandleDesc.of(
                                                        DirectMethodHandleDesc.Kind.STATIC,
                                                        ClassDesc.ofDescriptor(bsmClassName),
                                                        bsmMethodName,
                                                        bsmDescriptor
                                                ),
                                                "String",
                                                ConstantDescs.CD_String
                                        )
                                )
                                .areturn()
                        )
                )
        );
        gc = MethodHandles.lookup().defineClass(byteArray);
    }

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