74 lines
2.8 KiB
Java
74 lines
2.8 KiB
Java
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/*
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* Copyright (c) 2020, 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 8238550
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* @summary Test that verifer assignability checks involving the 'this' pointer
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* work ok for hidden classes.
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* @compile FieldInSuperSub.jasm
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* @run main/othervm -Xverify:remote FieldInSuper
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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.MethodHandles;
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import java.lang.invoke.MethodHandles.Lookup;
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import static java.lang.invoke.MethodHandles.Lookup.ClassOption.*;
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import java.nio.file.Path;
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import java.nio.file.Paths;
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public class FieldInSuper {
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static final Path CLASSES_DIR = Paths.get(System.getProperty("test.classes"));
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String hello = "hello";
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static byte[] readClassFile(String classFileName) throws Exception {
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File classFile = new File(CLASSES_DIR + 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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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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public static void main(String[] args) throws Throwable {
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Lookup lookup = MethodHandles.lookup();
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byte[] bytes = readClassFile("FieldInSuperSub.class");
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// Define a hidden class that loads the 'this' pointer and then
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// references field 'hello' using:
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// getfield Field FieldInSuper.hello:"Ljava/lang/String;";
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// This will cause the verifier to check that the 'this' pointer for
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// the hidden class is assignable to FieldInSuper.
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Class<?> c = lookup.defineHiddenClass(bytes, true, NESTMATE).lookupClass();
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Object fss = c.newInstance();
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c.getMethod("printMe").invoke(fss);
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}
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}
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