russell@unturf.com
0a580b313d
Authors: russell@unturf.com · brackishbert@gmail.com · foxhop.net · TimeHexOn.com Patches, unit tests, benchmarks, whitepaper, and outreach briefs. Public domain — no copyright claimed. Use freely.
59 lines
2.4 KiB
Java
59 lines
2.4 KiB
Java
/*
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* Copyright (c) 2021, 2025, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/* @test
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* @run junit/othervm CallerSensitiveMethodHandle
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* @summary Check Lookup findVirtual, findStatic and unreflect behavior with
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* caller sensitive methods with focus on AccessibleObject.setAccessible
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*/
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import java.lang.invoke.MethodHandle;
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import java.lang.invoke.MethodHandles;
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import java.lang.invoke.MethodHandles.Lookup;
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import java.lang.reflect.Field;
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import static java.lang.invoke.MethodType.*;
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import static org.junit.jupiter.api.Assertions.*;
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import org.junit.jupiter.api.Test;
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public class CallerSensitiveMethodHandle {
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private static int field = 0;
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@Test
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public void privateField() throws Throwable {
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Lookup l = MethodHandles.lookup();
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Field f = CallerSensitiveMethodHandle.class.getDeclaredField("field");
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MethodHandle mh = l.findVirtual(Field.class, "setInt", methodType(void.class, Object.class, int.class));
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int newValue = 5;
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mh.invokeExact(f, (Object) null, newValue);
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assertEquals(newValue, field);
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}
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@Test
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public void lookupItself() throws Throwable {
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Lookup lookup = MethodHandles.lookup();
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MethodHandle MH_lookup2 = lookup.findStatic(MethodHandles.class, "lookup", methodType(Lookup.class));
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Lookup lookup2 = (Lookup) MH_lookup2.invokeExact();
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System.out.println(lookup2 + " original lookup class " + lookup.lookupClass());
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assertSame(lookup.lookupClass(), lookup2.lookupClass());
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}
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}
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