86 lines
3.4 KiB
Java
86 lines
3.4 KiB
Java
/*
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* Copyright (c) 2014, 2018, 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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package vm.mlvm.anonloader.share;
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import jdk.internal.org.objectweb.asm.ClassReader;
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import vm.mlvm.share.MlvmTest;
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import vm.mlvm.share.MlvmTestExecutor;
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import vm.mlvm.share.Env;
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import vm.share.FileUtils;
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import vm.share.UnsafeAccess;
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import vm.share.options.Option;
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/**
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* This is a base class for kind of tests, which modify the parent class name of test dummy class vm.mlvm.share.AnonkTestee01
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* with an arbitrary string, load the modified class using Unsafe.defineAnonymousClass and instantiate it.
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* <p>
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* The tests can extend this class or use it from command-line to provide the actual data:
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* <ul>
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* <li>new parent class name,
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* <li>optionally the list of expected exceptions to be thrown during class loading and instantiation
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* (see {@link vm.mlvm.share.MlvmTest#setRequiredExceptions(Class<? extends Throwable>... classes)} for details)
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* </ul>
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*/
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public class ReplaceClassParentTest extends MlvmTest {
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@Option(name = "newParent", default_value = "", description = "String to replace the name of the parent class of the testee")
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private String newParentOpt;
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public void setReplaceParent(String newParent) {
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newParentOpt = newParent;
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}
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private static final Class<?> TESTEE_CLASS = AnonkTestee01.class;
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public ReplaceClassParentTest() {
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}
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public boolean run() throws Throwable {
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byte[] classBytes = FileUtils.readClass(TESTEE_CLASS.getName());
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ClassReader reader = new ClassReader(classBytes);
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int superclassNameIdx = reader.readUnsignedShort(reader.header + 4);
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int cpLength = reader.getItemCount();
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if (superclassNameIdx == 0) {
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throw new RuntimeException("Test bug: unable to find super class"
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+ " name index");
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}
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Env.traceDebug("Superclass name CP index: " + superclassNameIdx
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+ "; replacing CP entry with '" + newParentOpt + "'");
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// now, construction of cp patch
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Object cpPatch[] = new Object[cpLength];
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cpPatch[superclassNameIdx] = newParentOpt;
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// define and instantiate
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UnsafeAccess.unsafe.defineAnonymousClass(TESTEE_CLASS, classBytes,
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cpPatch).newInstance();
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// Whether test should pass or fail should be specified via requireExceptions mechanism in MlvmTest
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return true;
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}
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public static void main(String[] args) {
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MlvmTestExecutor.launch(args);
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}
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}
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