1 /*
   2  * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 /*
  25  * @test
  26  * @bug 8074306 8073432 8074501
  27  * @summary NULLCHK is emitted as Object.getClass
  28  * @compile -source 6 -target 6 TestSyntheticNullChecks.java
  29  * @run main TestSyntheticNullChecks 6
  30  * @clean TestSyntheticNullChecks*
  31  * @compile -source 7 -target 7 TestSyntheticNullChecks.java
  32  * @run main TestSyntheticNullChecks 7
  33  * @clean TestSyntheticNullChecks*
  34  * @compile TestSyntheticNullChecks.java
  35  * @run main TestSyntheticNullChecks 9
  36  */
  37 public class TestSyntheticNullChecks {
  38 
  39     class Inner { }
  40 
  41     static void generateSyntheticNPE(TestSyntheticNullChecks outer) {
  42         outer.new Inner(); //javac will generate a synthetic NPE check for 'outer'
  43     }
  44 
  45     public static void main(String[] args) {
  46         int version = Integer.valueOf(args[0]);
  47         boolean useObjects = version >= 7;
  48         try {
  49             generateSyntheticNPE(null);
  50         } catch (NullPointerException npe) {
  51             boolean hasRequireNotNull = false;
  52             for (StackTraceElement e : npe.getStackTrace()) {
  53                 if (e.getClassName().equals("java.util.Objects") &&
  54                         e.getMethodName().equals("requireNonNull")) {
  55                     hasRequireNotNull = true;
  56                     break;
  57                 }
  58             }
  59             if (hasRequireNotNull != useObjects) {
  60                 throw new AssertionError();
  61             }
  62         }
  63     }
  64 }