1 /*
   2  * Copyright (c) 2011, 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 /**
  26  * @test
  27  * @bug 6478991
  28  * @summary C1 NullCheckEliminator yields incorrect exceptions
  29  *
  30  * @run main/othervm -XX:CompileOnly=NullCheckTest.test,NullCheckTest.inlined  -Xcomp NullCheckTest
  31  */
  32 
  33 public class NullCheckTest {
  34         static class A {
  35                 int f;
  36 
  37                 public final void inlined(A a) {
  38                         // This cast is intended to fail.
  39                         B b = ((B) a);
  40                 }
  41         }
  42 
  43         static class B extends A {
  44         }
  45 
  46 
  47         private static void test(A a1, A a2) {
  48                 // Inlined call must do a null check on a1.
  49                 // However, the exlipcit NullCheck instruction is eliminated and
  50                 // the null check is folded into the field load below, so the
  51                 // exception in the inlined method is thrown before the null check
  52                 // and the NullPointerException is not thrown.
  53                 a1.inlined(a2);
  54 
  55                 int x = a1.f;
  56         }
  57 
  58         public static void main(String[] args) {
  59                 // load classes
  60                 new B();
  61                 try {
  62                         test(null, new A());
  63 
  64                         throw new InternalError("FAILURE: no exception");
  65                 } catch (NullPointerException ex) {
  66                         System.out.println("CORRECT: NullPointerException");
  67                 } catch (ClassCastException ex) {
  68                         System.out.println("FAILURE: ClassCastException");
  69                         throw ex;
  70                 }
  71         }
  72 }