InvokeSpecialAnonTest.java

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * 2 along with this work; if not, write to the Free Software Foundation,
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/*
 * @test
 * @bug 8026365
 * @summary Test invokespecial of host class method from an anonymous class
 * @author  Robert Field
 * @library /testlibrary
 * @compile -XDignore.symbol.file InvokeSpecialAnonTest.java
 * @run main ClassFileInstaller InvokeSpecialAnonTest AnonTester
 * @run main/othervm -Xbootclasspath/a:. -Xverify:all InvokeSpecialAnonTest
 */
import jdk.internal.org.objectweb.asm.*;
import java.lang.reflect.Constructor;
import sun.misc.Unsafe;

public class InvokeSpecialAnonTest implements Opcodes {

    static byte[] anonClassBytes() throws Exception {
        ClassWriter cw = new ClassWriter(0);
        MethodVisitor mv;

        cw.visit(V1_8, ACC_FINAL + ACC_SUPER, "Anon", null, "java/lang/Object", null);

        {
            mv = cw.visitMethod(ACC_PUBLIC, "<init>", "()V", null, null);
            mv.visitCode();
            mv.visitVarInsn(ALOAD, 0);
            mv.visitMethodInsn(INVOKESPECIAL, "java/lang/Object", "<init>", "()V");
            mv.visitInsn(RETURN);
            mv.visitMaxs(2, 2);
            mv.visitEnd();
        }
        {
            mv = cw.visitMethod(ACC_PUBLIC, "m", "(LInvokeSpecialAnonTest;)I", null, null);
            mv.visitCode();
            mv.visitVarInsn(ALOAD, 0);
            mv.visitVarInsn(ALOAD, 1);
            mv.visitMethodInsn(INVOKESPECIAL, "InvokeSpecialAnonTest", "privMethod", "()I");
            mv.visitInsn(IRETURN);
            mv.visitMaxs(2, 3);
            mv.visitEnd();
        }
        cw.visitEnd();

        return cw.toByteArray();
    }

    private int privMethod() { return 1234; }

    public static void main(String[] args) throws Exception {
        Class<?> klass = InvokeSpecialAnonTest.class;
        try {
           Class<?> result = AnonTester.defineTest(klass, anonClassBytes());
           System.out.println("Passed.");
        } catch (Exception e) {
           e.printStackTrace();
           throw e;
        }
    }
}


class AnonTester {
    private static final Unsafe UNSAFE = Unsafe.getUnsafe();

    public static Class<?> defineTest(Class<?> targetClass, byte[] classBytes) throws Exception {
        return UNSAFE.defineAnonymousClass(targetClass, classBytes, null);
    }
}