test/compiler/codegen/C1NullCheckOfNullStore.java

/*
 * Copyright (c) 2014, 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.
 *
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 * questions.
 */

/*
 * @test
 * @bug 8039043
 * @summary Null check is placed in a wrong place when storing a null to an object field on x64 with compressed oops off
 * @run main/othervm -Xbatch -XX:+IgnoreUnrecognizedVMOptions -XX:CompileCommand=compileonly,C1NullCheckOfNullStore::test -XX:+TieredCompilation -XX:TieredStopAtLevel=1 -XX:-UseCompressedOops C1NullCheckOfNullStore
 *
 */

public class C1NullCheckOfNullStore {
  private static class Foo {
    Object bar;
  }
  static private void test(Foo x) {
    x.bar = null;
  }
  static public void main(String args[]) {
    Foo x = new Foo();
    for (int i = 0; i < 10000; i++) {
      test(x);
    }
    boolean gotNPE = false;
    try {
      for (int i = 0; i < 10000; i++) {
        test(null);
      }
    }
    catch(NullPointerException e) {
      gotNPE = true;
    }
    if (!gotNPE) {
      throw new Error("Expecting a NullPointerException");
    }
  }
}