75 lines
2.7 KiB
Java
75 lines
2.7 KiB
Java
/*
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* Copyright (c) 2021, 2022, 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 8266496
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* @summary Test that Whitebox.isClassAlive() works with hidden classes.
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* @library /test/lib
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* @build jdk.test.whitebox.WhiteBox
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* @run driver jdk.test.lib.helpers.ClassFileInstaller jdk.test.whitebox.WhiteBox
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* @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI TestHiddenClassIsAlive
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*/
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import java.io.ByteArrayOutputStream;
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import java.io.File;
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import java.io.FileInputStream;
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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.invoke.MethodType;
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import java.lang.ref.Reference;
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import jdk.test.whitebox.WhiteBox;
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final class MyClass {
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MyClass() {}
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public Object get(int i) { return null; }
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}
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public class TestHiddenClassIsAlive {
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public static void main(String[] args) throws Throwable {
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byte[] classBytes = readClassFile("MyClass.class");
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Lookup lookup = MethodHandles.lookup();
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Class<?> c = lookup.defineHiddenClass(classBytes, true).lookupClass();
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if (!WhiteBox.getWhiteBox().isClassAlive("MyClass")) {
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throw new RuntimeException("Hidden class should be alive");
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}
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Reference.reachabilityFence(c);
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}
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static byte[] readClassFile(String classFileName) throws Exception {
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File classFile = new File(System.getProperty("test.classes") + File.separator + classFileName);
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try (FileInputStream in = new FileInputStream(classFile);
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ByteArrayOutputStream out = new ByteArrayOutputStream())
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{
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int b;
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while ((b = in.read()) != -1) {
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out.write(b);
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}
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return out.toByteArray();
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}
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}
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}
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