80 lines
2.9 KiB
Java
80 lines
2.9 KiB
Java
/*
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* Copyright (c) 2023, 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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/**
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* @test
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* @bug 8301721
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* @library /test/lib
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* @run main FindSpecialObjectMethod
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* @summary Test findSpecial on Object methods calling from a class or interface.
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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.util.Objects;
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import static java.lang.invoke.MethodType.*;
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import static jdk.test.lib.Asserts.*;
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public class FindSpecialObjectMethod {
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static class C {
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public static Object test(C o) throws Throwable {
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MethodHandles.Lookup lookup = MethodHandles.lookup();
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MethodHandle mh = lookup.findSpecial(Object.class, "toString", methodType(String.class), C.class);
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return mh.invoke(o);
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}
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public String toString() {
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return "C";
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}
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}
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interface I {
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static Object test(I o) throws Throwable {
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MethodHandles.Lookup lookup = MethodHandles.lookup();
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MethodHandle mh = lookup.findSpecial(Object.class, "toString", methodType(String.class), I.class);
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return mh.invoke(o);
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}
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static void noAccess() throws Throwable {
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try {
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MethodHandles.Lookup lookup = MethodHandles.lookup();
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MethodHandle mh = lookup.findSpecial(String.class, "hashCode", methodType(int.class), I.class);
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throw new RuntimeException("IllegalAccessException not thrown");
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} catch (IllegalAccessException ex) {}
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}
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}
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public static void main(String... args) throws Throwable {
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// Object.toString can be called from invokespecial from within
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// a special caller class C or interface I
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C c = new C();
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I i = new I() {};
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assertEquals(C.test(c), Objects.toIdentityString(c));
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assertEquals(I.test(i), Objects.toIdentityString(i));
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// I has no access to methods in other class besides Object
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I.noAccess();
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}
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}
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