test/hotspot/jtreg/runtime/Unsafe/PrimitiveHostClass.java

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 * 2 along with this work; if not, write to the Free Software Foundation,
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import java.awt.Component;
import java.lang.reflect.Field;
import static jdk.internal.org.objectweb.asm.Opcodes.*;
import jdk.internal.org.objectweb.asm.*;
import jdk.internal.misc.Unsafe;

/*
 * @test PrimitiveHostClass
 * @bug 8140665
 * @summary Throws IllegalArgumentException if host class is a primitive class.
 * @modules java.base/jdk.internal.org.objectweb.asm
 *          java.base/jdk.internal.misc
 * @compile -XDignore.symbol.file PrimitiveHostClass.java
 * @run main/othervm PrimitiveHostClass
 */

public class PrimitiveHostClass {

    static final Unsafe U = Unsafe.getUnsafe();

    public static void testVMAnonymousClass(Class<?> hostClass) {

        // choose a class name in the same package as the host class
        String prefix = packageName(hostClass);
        if (prefix.length() > 0)
            prefix = prefix.replace('.', '/') + "/";
        String className = prefix + "Anon";

        // create the class
        String superName = "java/lang/Object";
        ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_MAXS
                                         + ClassWriter.COMPUTE_FRAMES);
        cw.visit(V1_8, ACC_PUBLIC + ACC_FINAL + ACC_SUPER,
                 className, null, superName, null);
        byte[] classBytes = cw.toByteArray();
        int cpPoolSize = constantPoolSize(classBytes);
        Class<?> anonClass =
            U.defineAnonymousClass(hostClass, classBytes, new Object[cpPoolSize]);
    }

    private static String packageName(Class<?> c) {
        if (c.isArray()) {
            return packageName(c.getComponentType());
        } else {
            String name = c.getName();
            int dot = name.lastIndexOf('.');
            if (dot == -1) return "";
            return name.substring(0, dot);
        }
    }

    private static int constantPoolSize(byte[] classFile) {
        return ((classFile[8] & 0xFF) << 8) | (classFile[9] & 0xFF);
    }

    public static void main(String args[]) {
        testVMAnonymousClass(PrimitiveHostClass.class);
        try {
            testVMAnonymousClass(int.class);
            throw new RuntimeException(
                "Expected IllegalArgumentException not thrown");
        } catch (IllegalArgumentException e) {
            // Expected
        }
    }
}