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