GetUnsafeTest.java

/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
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 * 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.
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/**
 * @test
 * @bug 7196190
 * @summary Improve method of handling MethodHandles
 *
 * @run main/othervm/policy=jtreg.security.policy/secure=java.lang.SecurityManager GetUnsafeTest
 */

import java.lang.invoke.*;
import java.lang.reflect.Method;
import java.util.Arrays;

public class GetUnsafeTest {
    static final String NAME = "sun.misc.Unsafe";

    private static boolean isTestFailed = false;

    private static void fail() {
        isTestFailed = true;
        try { throw new Exception(); } catch (Throwable e) {
            StackTraceElement frame = e.getStackTrace()[1];
            System.out.printf("Failed at %s:%d\n", frame.getFileName(), frame.getLineNumber());
        }
    }

    public static void main(String[] args) throws Throwable {
        {
            final MethodType mt = MethodType.methodType(Class.class, String.class);
            final MethodHandle mh = MethodHandles.lookup()
                    .findStatic(Class.class, "forName", mt);

            try { Class.forName(NAME);                         fail(); } catch (Throwable e) {}

            try { mh.invoke(NAME);                             fail(); } catch (Throwable e) {}
            try { mh.bindTo(NAME).invoke();                    fail(); } catch (Throwable e) {}
            try { mh.invokeWithArguments(Arrays.asList(NAME)); fail(); } catch (Throwable e) {}
            try { mh.invokeWithArguments(NAME);                fail(); } catch (Throwable e) {}
            try { Class cls = (Class) mh.invokeExact(NAME);    fail(); } catch (Throwable e) {}
        }

        {
            final Method fnMethod = Class.class.getMethod("forName", String.class);
            final MethodType mt = MethodType.methodType(Object.class, Object.class, Object[].class);
            final MethodHandle mh = MethodHandles.lookup()
                    .findVirtual(Method.class, "invoke", mt)
                    .bindTo(fnMethod);

            try { fnMethod.invoke(null, NAME); fail(); } catch (Throwable e) {}

            try { mh.bindTo(null).bindTo(new Object[]{NAME}).invoke();             fail(); } catch (Throwable e) {}
            try { mh.invoke(null, new Object[]{NAME});                             fail(); } catch (Throwable e) {}
            try { mh.invokeWithArguments(null, new Object[]{NAME});                fail(); } catch (Throwable e) {}
            try { mh.invokeWithArguments(Arrays.asList(null, new Object[]{NAME})); fail(); } catch (Throwable e) {}
            try { Object obj = mh.invokeExact((Object) null, new Object[]{NAME});  fail(); } catch (Throwable e) {}
        }

        {
            final Method fnMethod = Class.class.getMethod("forName", String.class);
            final MethodType mt = MethodType.methodType(Object.class, Object.class, Object[].class);

            final MethodHandle mh = MethodHandles.lookup().bind(fnMethod, "invoke", mt);

            try { mh.bindTo(null).bindTo(new Object[]{NAME}).invoke();            fail(); } catch (Throwable e) {}
            try { mh.invoke(null, new Object[]{NAME});                            fail(); } catch (Throwable e) {}
            try { mh.invokeWithArguments(null, NAME);                             fail(); } catch (Throwable e) {}
            try { mh.invokeWithArguments(Arrays.asList(null, NAME));              fail(); } catch (Throwable e) {}
            try { Object obj = mh.invokeExact((Object) null, new Object[]{NAME}); fail(); } catch (Throwable e) {}
        }

        {
            final Method fnMethod = Class.class.getMethod("forName", String.class);
            final MethodHandle mh = MethodHandles.lookup().unreflect(fnMethod);

            try { mh.bindTo(NAME).invoke();                    fail(); } catch (Throwable e) {}
            try { mh.invoke(NAME);                             fail(); } catch (Throwable e) {}
            try { mh.invokeWithArguments(NAME);                fail(); } catch (Throwable e) {}
            try { mh.invokeWithArguments(Arrays.asList(NAME)); fail(); } catch (Throwable e) {}
            try { Class cls = (Class) mh.invokeExact(NAME);    fail(); } catch (Throwable e) {}
        }

        if (!isTestFailed) {
            System.out.println("TEST PASSED");
        } else {
            System.out.println("TEST FAILED");
            System.exit(1);
        }
    }
}