Quellcode-Bibliothek

^© Kompilation durch diese Firma

[Weder Korrektheit noch Funktionsfähigkeit der Software werden zugesichert.]

Datei: ZipFSTester.java Sprache: JAVA

/*
* Copyright (c) 2020, 2022, 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 8238358 8247444
* @summary Ensure that sun.misc.Unsafe::objectFieldOffset and staticFieldOffset
*          throw UnsupportedOperationException on Field of a hidden or record class
* @modules jdk.unsupported
* @compile UnsafeFieldOffsets.java
* @run testng/othervm UnsafeFieldOffsets
*/

import sun.misc.Unsafe;

import java.io.IOException;
import java.io.UncheckedIOException;
import java.lang.invoke.MethodHandles;
import java.lang.reflect.Field;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;

import org.testng.annotations.Test;
import static org.testng.Assert.*;

public class UnsafeFieldOffsets {
    static class Fields {
        static final Object STATIC_FINAL = new Object();
        static Object STATIC_NON_FINAL = new Object();
        final Object FINAL = new Object();
        Object NON_FINAL = new Object();
    }
    record TestRecord(int i) {
        static final Object STATIC_FINAL = new Object();
        static Object STATIC_NON_FINAL = new Object();
    }

    private static Unsafe UNSAFE = getUnsafe();
    private static final Class<?> HIDDEN_CLASS = defineHiddenClass();
    private static final Class<?> RECORD_CLASS = TestRecord.class;

    private static Unsafe getUnsafe() {
        try {
            Field f = Unsafe.class.getDeclaredField("theUnsafe");
            f.setAccessible(true);
            return (Unsafe) f.get(null);
        } catch (ReflectiveOperationException e) {
            throw new RuntimeException(e);
        }
    }

    private static Class<?> defineHiddenClass() {
        String classes = System.getProperty("test.classes");
        Path cf = Paths.get(classes, "UnsafeFieldOffsets$Fields.class");
        try {
            byte[] bytes = Files.readAllBytes(cf);
            Class<?> c = MethodHandles.lookup().defineHiddenClass(bytes, true).lookupClass();
            assertTrue(c.isHidden());
            return c;
        } catch (IOException e) {
            throw new UncheckedIOException(e);
        } catch (IllegalAccessException e) {
            throw new RuntimeException(e);
        }
    }

    @Test
    public void testNormalClass() throws Throwable {
        // hidden class
        testStaticField(HIDDEN_CLASS, "STATIC_FINAL");
        testStaticField(HIDDEN_CLASS, "STATIC_NON_FINAL");
        testInstanceField(HIDDEN_CLASS, "FINAL");
        testInstanceField(HIDDEN_CLASS, "NON_FINAL");
    }

    @Test
    public void testHiddenClass() throws Throwable {
        // hidden class
        testStaticField(HIDDEN_CLASS, "STATIC_FINAL");
        testStaticField(HIDDEN_CLASS, "STATIC_NON_FINAL");
        testInstanceField(HIDDEN_CLASS, "FINAL");
        testInstanceField(HIDDEN_CLASS, "NON_FINAL");
    }

    @Test
    public void testRecordClass() throws Throwable {
        // record class
        testRecordStaticField(RECORD_CLASS, "STATIC_FINAL");
        testRecordStaticField(RECORD_CLASS, "STATIC_NON_FINAL");
        testRecordInstanceField(RECORD_CLASS, "i");
    }

    private static void testStaticField(Class<?> c, String name) throws Exception {
        Field f = c.getDeclaredField(name);
        try {
            UNSAFE.staticFieldOffset(f);
            assertFalse(c.isHidden(), "Expected UOE thrown: " + c);
        } catch (UnsupportedOperationException e) {
            assertTrue(c.isHidden(), "Expected hidden class: " + c);
        }
    }

    private static void testInstanceField(Class<?> c, String name) throws Exception {
        Field f = c.getDeclaredField(name);
        try {
            UNSAFE.objectFieldOffset(f);
            assertFalse(c.isHidden(), "Expected UOE thrown: " + c);
        } catch (UnsupportedOperationException e) {
            assertTrue(c.isHidden(), "Expected hidden class: " + c);
        }
    }

    @SuppressWarnings("preview")
    private static void testRecordStaticField(Class<?> c, String name) throws Exception {
        Field f = c.getDeclaredField(name);
        try {
            UNSAFE.staticFieldOffset(f);
            assertFalse(c.isRecord(), "Expected UOE thrown: " + c);
        } catch (UnsupportedOperationException e) {
            assertTrue(c.isRecord(), "Expected record class: " + c);
        }
    }

    @SuppressWarnings("preview")
    private static void testRecordInstanceField(Class<?> c, String name) throws Exception {
        Field f = c.getDeclaredField(name);
        try {
            UNSAFE.objectFieldOffset(f);
            assertFalse(c.isRecord(), "Expected UOE thrown: " + c);
        } catch (UnsupportedOperationException e) {
            assertTrue(c.isRecord(), "Expected record class: " + c);
        }
    }
}

¤ Dauer der Verarbeitung: 0.18 Sekunden (vorverarbeitet) ¤

Download des Quellennavigators
Download des sprechenden Kalenders
Eigene Datei ansehen

Haftungshinweis

Die Informationen auf dieser Webseite wurden nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit, noch Qualität der bereit gestellten Informationen zugesichert.

Bemerkung:

Die farbliche Syntaxdarstellung ist noch experimentell.