--- /dev/null 2020-03-26 16:02:19.000000000 -0700 +++ new/test/hotspot/jtreg/runtime/HiddenClasses/FieldInSuper.java 2020-03-26 16:02:18.000000000 -0700 @@ -0,0 +1,73 @@ +/* + * Copyright (c) 2020, Oracle and/or its affiliates. All rights reserved. + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. + * + * This code is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 only, as + * published by the Free Software Foundation. + * + * This code is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License + * version 2 for more details (a copy is included in the LICENSE file that + * accompanied this code). + * + * You should have received a copy of the GNU General Public License version + * 2 along with this work; if not, write to the Free Software Foundation, + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. + * + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA + * or visit www.oracle.com if you need additional information or have any + * questions. + */ + +/* + * @test + * @bug 8238550 + * @summary Test that verifer assignability checks involving the 'this' pointer + * work ok for hidden classes. + * @compile FieldInSuperSub.jasm + * @run main/othervm -Xverify:remote FieldInSuper + */ + +import java.io.ByteArrayOutputStream; +import java.io.File; +import java.io.FileInputStream; +import java.lang.invoke.MethodHandles; +import java.lang.invoke.MethodHandles.Lookup; +import static java.lang.invoke.MethodHandles.Lookup.ClassOption.*; +import java.nio.file.Path; +import java.nio.file.Paths; + +public class FieldInSuper { + + static final Path CLASSES_DIR = Paths.get(System.getProperty("test.classes")); + String hello = "hello"; + + static byte[] readClassFile(String classFileName) throws Exception { + File classFile = new File(CLASSES_DIR + File.separator + classFileName); + try (FileInputStream in = new FileInputStream(classFile); + ByteArrayOutputStream out = new ByteArrayOutputStream()) { + int b; + while ((b = in.read()) != -1) { + out.write(b); + } + return out.toByteArray(); + } + } + + public static void main(String[] args) throws Throwable { + Lookup lookup = MethodHandles.lookup(); + byte[] bytes = readClassFile("FieldInSuperSub.class"); + + // Define a hidden class that loads the 'this' pointer and then + // references field 'hello' using: + // getfield Field FieldInSuper.hello:"Ljava/lang/String;"; + // This will cause the verifier to check that the 'this' pointer for + // the hidden class is assignable to FieldInSuper. + Class c = lookup.defineHiddenClass(bytes, true, NESTMATE).lookupClass(); + Object fss = c.newInstance(); + c.getMethod("printMe").invoke(fss); + } + +}