1 /*
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8  * published by the Free Software Foundation.
9  *
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11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
13  * version 2 for more details (a copy is included in the LICENSE file that
14  * accompanied this code).
15  *
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18  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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24 
25 /**
26  * @test
27  * @bug 8176518
28  * @summary Invalid ImplicitNullChecks when heap base not protected
29  *
30  * @run main/othervm -XX:ObjectAlignmentInBytes=16 -XX:HeapBaseMinAddress=64g
31  *      -XX:-TieredCompilation -Xbatch
32  *      compiler.c2.TestNPEHeapBased
33  * @requires vm.bits == "64"
34  */
35 
36 package compiler.c2;
37 public class TestNPEHeapBased {
38 
39     TestNPEHeapBased instance = null;
40     int i = 0;
41 
set_i(int value)42     public void set_i(int value) {
43         instance.i = value;
44     }
45 
46 
47     static final int loop_cnt = 200000;
48 
main(String args[])49     public static void main(String args[]){
50         TestNPEHeapBased xyz = new TestNPEHeapBased();
51         xyz.instance = xyz;
52         for (int x = 0; x < loop_cnt; x++) xyz.set_i(x);
53         xyz.instance = null;
54         try {
55             xyz.set_i(0);
56         } catch (NullPointerException npe) {
57             System.out.println("Got expected NullPointerException:");
58             npe.printStackTrace();
59             return;
60         }
61         throw new InternalError("NullPointerException is missing!");
62     }
63 
64 }
65