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
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  22  *
  23  */
  24 
  25 /**
  26  * @test
  27  * @bug 6478991
  28  * @summary C1 NullCheckEliminator yields incorrect exceptions
  29  *
  30  * @run main/othervm -Xcomp
  31  *      -XX:CompileCommand=compileonly,compiler.c1.NullCheckTest::test
  32  *      -XX:CompileCommand=compileonly,compiler.c1.NullCheckTest::inlined
  33  *      compiler.c1.NullCheckTest
  34  */
  35 
  36 package compiler.c1;
  37 
  38 public class NullCheckTest {
  39     static class A {
  40         int f;
  41 
  42         public final void inlined(A a) {
  43             // This cast is intended to fail.
  44             B b = ((B) a);
  45         }
  46     }
  47 
  48     static class B extends A {
  49     }
  50 
  51 
  52     private static void test(A a1, A a2) {
  53         // Inlined call must do a null check on a1.
  54         // However, the exlipcit NullCheck instruction is eliminated and
  55         // the null check is folded into the field load below, so the
  56         // exception in the inlined method is thrown before the null check
  57         // and the NullPointerException is not thrown.
  58         a1.inlined(a2);
  59 
  60         int x = a1.f;
  61     }
  62 
  63     public static void main(String[] args) {
  64         // load classes
  65         new B();
  66         try {
  67                 test(null, new A());
  68 
  69                 throw new InternalError("FAILURE: no exception");
  70         } catch (NullPointerException ex) {
  71                 System.out.println("CORRECT: NullPointerException");
  72         } catch (ClassCastException ex) {
  73                 System.out.println("FAILURE: ClassCastException");
  74                 throw ex;
  75         }
  76     }
  77 }