--- /dev/null 2018-04-28 00:26:07.190086997 -0400 +++ new/test/hotspot/jtreg/runtime/Nestmates/privateStaticFields/TestMethodHandles.java 2018-05-18 03:32:20.952085755 -0400 @@ -0,0 +1,160 @@ +/* + * Copyright (c) 2017, 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 8046171 + * @summary Test access to private static fields between nestmates and nest-host + * using different flavours of named nested types using MethodHandles + * @run main TestMethodHandles + */ + +import java.lang.invoke.*; +import static java.lang.invoke.MethodHandles.*; + +import java.lang.reflect.Field; + +public class TestMethodHandles { + + // private static field of nest-host for nestmates to access + private static int priv_field; + + // public constructor so we aren't relying on private access + public TestMethodHandles() {} + + // Methods that will access private static fields of nestmates + + // NOTE: No InnerNested calls in this test because non-static nested types + // can't have static fields. Also no StaticIface calls as static interface + // fields must be public (and final) + + void access_priv(TestMethodHandles o) throws Throwable { + MethodHandle mh = lookup().findStaticGetter(o.getClass(), "priv_field", int.class); + priv_field = (int) mh.invoke(); + priv_field = (int) mh.invokeExact(); + mh = lookup().findStaticSetter(o.getClass(), "priv_field", int.class); + mh.invoke(2); + mh.invokeExact(3); + } + void access_priv(StaticNested o) throws Throwable { + MethodHandle mh = lookup().findStaticGetter(o.getClass(), "priv_field", int.class); + priv_field = (int) mh.invoke(); + priv_field = (int) mh.invokeExact(); + mh = lookup().findStaticSetter(o.getClass(), "priv_field", int.class); + mh.invoke(2); + mh.invokeExact(3); + } + + // The various nestmates + + static interface StaticIface { + + // Methods that will access private static fields of nestmates + + default void access_priv(TestMethodHandles o) throws Throwable { + MethodHandle mh = lookup().findStaticGetter(o.getClass(), "priv_field", int.class); + int priv_field = (int) mh.invoke(); + priv_field = (int) mh.invokeExact(); + mh = lookup().findStaticSetter(o.getClass(), "priv_field", int.class); + mh.invoke(2); + mh.invokeExact(3); + } + default void access_priv(StaticNested o) throws Throwable { + MethodHandle mh = lookup().findStaticGetter(o.getClass(), "priv_field", int.class); + int priv_field = (int) mh.invoke(); + priv_field = (int) mh.invokeExact(); + mh = lookup().findStaticSetter(o.getClass(), "priv_field", int.class); + mh.invoke(2); + mh.invokeExact(3); + } + } + + static class StaticNested { + + private static int priv_field; + + // public constructor so we aren't relying on private access + public StaticNested() {} + + // Methods that will access private static fields of nestmates + + void access_priv(TestMethodHandles o) throws Throwable { + MethodHandle mh = lookup().findStaticGetter(o.getClass(), "priv_field", int.class); + priv_field = (int) mh.invoke(); + priv_field = (int) mh.invokeExact(); + mh = lookup().findStaticSetter(o.getClass(), "priv_field", int.class); + mh.invoke(2); + mh.invokeExact(3); + } + void access_priv(StaticNested o) throws Throwable { + MethodHandle mh = lookup().findStaticGetter(o.getClass(), "priv_field", int.class); + priv_field = (int) mh.invoke(); + priv_field = (int) mh.invokeExact(); + mh = lookup().findStaticSetter(o.getClass(), "priv_field", int.class); + mh.invoke(2); + mh.invokeExact(3); + } + } + + class InnerNested { + + // public constructor so we aren't relying on private access + public InnerNested() {} + + void access_priv(TestMethodHandles o) throws Throwable { + MethodHandle mh = lookup().findStaticGetter(o.getClass(), "priv_field", int.class); + priv_field = (int) mh.invoke(); + priv_field = (int) mh.invokeExact(); + mh = lookup().findStaticSetter(o.getClass(), "priv_field", int.class); + mh.invoke(2); + mh.invokeExact(3); + } + void access_priv(StaticNested o) throws Throwable { + MethodHandle mh = lookup().findStaticGetter(o.getClass(), "priv_field", int.class); + priv_field = (int) mh.invoke(); + priv_field = (int) mh.invokeExact(); + mh = lookup().findStaticSetter(o.getClass(), "priv_field", int.class); + mh.invoke(2); + mh.invokeExact(3); + } + } + + public static void main(String[] args) throws Throwable { + TestMethodHandles o = new TestMethodHandles(); + StaticNested s = new StaticNested(); + InnerNested i = o.new InnerNested(); + StaticIface intf = new StaticIface() {}; + + o.access_priv(new TestMethodHandles()); + o.access_priv(s); + + s.access_priv(o); + s.access_priv(new StaticNested()); + + i.access_priv(o); + i.access_priv(s); + + intf.access_priv(o); + intf.access_priv(s); + } +}