1 /*
2 * Copyright (c) 2016, Red Hat, Inc. 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 * @summary implicit null check on brooks pointer must not cause crash
27 * @run main/othervm -XX:-BackgroundCompilation -XX:-UseOnStackReplacement -XX:-TieredCompilation -XX:+UseShenandoahGC -Xmx4G -XX:HeapBaseMinAddress=32G TestNullCheck
28 */
29
30 // HeapBaseMinAddress above forces compressed oops with a base
31
32 public class TestNullCheck {
33
34 int f;
35
36 static int test1(TestNullCheck o) {
37 return o.f;
38 }
39
40 static TestNullCheck static_obj = new TestNullCheck();
41
42 static int test2() {
43 return static_obj.f;
44 }
45
46 static public void main(String[] args) {
47 TestNullCheck o = new TestNullCheck();
48 for (int i = 0; i < 20000; i++) {
49 test1(o);
50 test2();
51 }
52 try {
53 test1(null);
54 } catch(NullPointerException npe) {}
55 static_obj = null;
56 try {
57 test2();
58 } catch(NullPointerException npe) {}
59 }
60 }
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1 /*
2 * Copyright (c) 2016, 2018, Red Hat, Inc. 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 TestNullCheck
26 * @summary implicit null check on brooks pointer must not cause crash
27 * @key gc
28 *
29 * @run main/othervm -XX:-BackgroundCompilation -XX:-UseOnStackReplacement -XX:-TieredCompilation
30 * -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC
31 * -Xmx4G -XX:HeapBaseMinAddress=32G TestNullCheck
32 */
33
34 // HeapBaseMinAddress above forces compressed oops with a base
35
36 public class TestNullCheck {
37
38 int f;
39
40 static int test1(TestNullCheck o) {
41 return o.f;
42 }
43
44 static TestNullCheck static_obj = new TestNullCheck();
45
46 static int test2() {
47 return static_obj.f;
48 }
49
50 static public void main(String[] args) {
51 TestNullCheck o = new TestNullCheck();
52 for (int i = 0; i < 20000; i++) {
53 test1(o);
54 test2();
55 }
56 try {
57 test1(null);
58 } catch (NullPointerException npe) {}
59 static_obj = null;
60 try {
61 test2();
62 } catch (NullPointerException npe) {}
63 }
64 }
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