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