105 lines
3.3 KiB
Java
105 lines
3.3 KiB
Java
/*
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* Copyright (c) 2016, 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 6822627
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* @summary Test that ReferenceType.constantPool does not produce an NPE
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* @author Egor Ushakov
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*
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* @modules jdk.jdi/com.sun.tools.jdi:+open
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*
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* @run build TestScaffold VMConnection
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* @run compile -g ConstantPoolInfoGC.java
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* @run main/othervm ConstantPoolInfoGC
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*/
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import com.sun.jdi.ReferenceType;
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import com.sun.tools.jdi.ReferenceTypeImpl;
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import java.lang.ref.Reference;
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import java.lang.reflect.Field;
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import java.util.Arrays;
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/********** target program **********/
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class ConstantPoolGCTarg {
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public static void main(String[] args){
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System.out.println("Anything");
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}
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}
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/********** test program **********/
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public class ConstantPoolInfoGC extends TestScaffold {
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ReferenceType targetClass;
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ConstantPoolInfoGC(String args[]) {
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super(args);
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}
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public static void main(String[] args) throws Exception {
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new ConstantPoolInfoGC(args).startTests();
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}
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/********** test core **********/
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protected void runTests() throws Exception {
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targetClass = startToMain("ConstantPoolGCTarg").location().declaringType();
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if (vm().canGetConstantPool()) {
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byte[] cpbytes = targetClass.constantPool();
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// imitate SoftReference cleared
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Field constantPoolBytesRef = ReferenceTypeImpl.class.getDeclaredField("constantPoolBytesRef");
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constantPoolBytesRef.setAccessible(true);
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Reference softRef = (Reference) constantPoolBytesRef.get(targetClass);
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softRef.clear();
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byte[] cpbytes2 = targetClass.constantPool();
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if (!Arrays.equals(cpbytes, cpbytes2)) {
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failure("Consequent constantPool results vary, first was : " + cpbytes + ", now: " + cpbytes2);
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};
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} else {
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System.out.println("can get constant pool version not supported");
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}
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/*
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* resume until end
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*/
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listenUntilVMDisconnect();
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/*
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* deal with results of test
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* if anything has called failure("foo") testFailed will be true
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*/
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if (!testFailed) {
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println("ConstantPoolInfoGC: passed");
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} else {
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throw new Exception("ConstantPoolInfoGC: failed");
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}
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}
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}
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