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.
120 lines
4.5 KiB
Java
120 lines
4.5 KiB
Java
/*
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* Copyright (c) 2020, 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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/**
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* @test
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* @summary Test java.lang.reflect.AccessibleObject with modules
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* @run junit/othervm --enable-final-field-mutation=ALL-UNNAMED -DwriteAccess=true HiddenClassTest
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* @run junit/othervm --illegal-final-field-mutation=deny -DwriteAccess=false HiddenClassTest
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*/
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import java.io.IOException;
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import java.io.UncheckedIOException;
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import java.lang.invoke.MethodHandles;
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import java.lang.reflect.Field;
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import java.lang.reflect.Modifier;
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import java.nio.file.Files;
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import java.nio.file.Path;
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import java.nio.file.Paths;
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import org.junit.jupiter.api.Test;
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import org.junit.jupiter.api.BeforeAll;
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import static org.junit.jupiter.api.Assertions.*;
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class HiddenClassTest {
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static Class<?> hiddenClass;
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static boolean writeAccess;
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@BeforeAll
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static void setup() throws Exception {
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String classes = System.getProperty("test.classes");
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Path cf = Path.of(classes, "Fields.class");
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byte[] bytes = Files.readAllBytes(cf);
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hiddenClass = MethodHandles.lookup().defineHiddenClass(bytes, true).lookupClass();
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String s = System.getProperty("writeAccess");
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assertNotNull(s);
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writeAccess = Boolean.valueOf(s);
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}
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/*
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* Test Field::set that can write the value of a non-static final field
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* in a normal class
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*/
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@Test
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void testFieldsInNormalClass() throws Throwable {
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// despite the name "HiddenClass", this class is loaded by the
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// class loader as non-hidden class
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Class<?> c = Fields.class;
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Fields o = new Fields();
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assertFalse(c.isHidden());
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readOnlyAccessibleObject(c, "STATIC_FINAL", null, true);
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readWriteAccessibleObject(c, "STATIC_NON_FINAL", null, false);
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if (writeAccess) {
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readWriteAccessibleObject(c, "FINAL", o, true);
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} else {
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readOnlyAccessibleObject(c, "FINAL", o, true);
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}
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readWriteAccessibleObject(c, "NON_FINAL", o, false);
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}
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/*
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* Test Field::set that fails to write the value of a non-static final field
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* in a hidden class
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*/
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@Test
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void testFieldsInHiddenClass() throws Throwable {
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assertTrue(hiddenClass.isHidden());
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Object o = hiddenClass.newInstance();
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readOnlyAccessibleObject(hiddenClass, "STATIC_FINAL", null, true);
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readWriteAccessibleObject(hiddenClass, "STATIC_NON_FINAL", null, false);
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readOnlyAccessibleObject(hiddenClass, "FINAL", o, true);
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readWriteAccessibleObject(hiddenClass, "NON_FINAL", o, false);
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}
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private static void readOnlyAccessibleObject(Class<?> c, String name, Object o, boolean isFinal) throws Exception {
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Field f = c.getDeclaredField(name);
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int modifier = f.getModifiers();
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if (isFinal) {
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assertTrue(Modifier.isFinal(modifier));
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} else {
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assertFalse(Modifier.isFinal(modifier));
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}
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assertTrue(f.trySetAccessible());
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assertTrue(f.get(o) != null);
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assertThrows(IllegalAccessException.class, () -> f.set(o, null));
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}
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private static void readWriteAccessibleObject(Class<?> c, String name, Object o, boolean isFinal) throws Exception {
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Field f = c.getDeclaredField(name);
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int modifier = f.getModifiers();
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if (isFinal) {
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assertTrue(Modifier.isFinal(modifier));
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} else {
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assertFalse(Modifier.isFinal(modifier));
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}
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assertTrue(f.trySetAccessible());
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assertTrue(f.get(o) != null);
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f.set(o, null);
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}
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}
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