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 TestExpandedWBLostNullCheckDep
26 * @summary Logic that moves a null check in the expanded barrier may cause a memory access that doesn't depend on the barrier to bypass the null check
27 * @requires vm.gc.Shenandoah & !vm.graal.enabled
28 * @requires vm.flavor == "server"
29 * @run main/othervm -XX:-BackgroundCompilation -XX:-UseOnStackReplacement -XX:-TieredCompilation
30 * -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC
31 * -XX:+StressGCM -XX:+StressLCM TestExpandedWBLostNullCheckDep
32 */
33
34 public class TestExpandedWBLostNullCheckDep {
35
36 static void test(int i, int[] arr) {
37 // arr.length depends on a null check for arr
38 if (i < 0 || i >= arr.length) {
39 }
40 // The write barrier here also depends on the null check. The
41 // null check is moved in the barrier to enable implicit null
42 // checks. The null check must not be moved arr.length
43 arr[i] = 0x42;
44 }
45
46 static public void main(String[] args) {
47 int[] int_arr = new int[10];
|
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 TestExpandedWBLostNullCheckDep
26 * @summary Logic that moves a null check in the expanded barrier may cause a memory access that doesn't depend on the barrier to bypass the null check
27 * @requires vm.gc.Shenandoah
28 * @requires vm.flavor == "server"
29 * @run main/othervm -XX:-BackgroundCompilation -XX:-UseOnStackReplacement -XX:-TieredCompilation
30 * -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC
31 * -XX:+StressGCM -XX:+StressLCM TestExpandedWBLostNullCheckDep
32 */
33
34 public class TestExpandedWBLostNullCheckDep {
35
36 static void test(int i, int[] arr) {
37 // arr.length depends on a null check for arr
38 if (i < 0 || i >= arr.length) {
39 }
40 // The write barrier here also depends on the null check. The
41 // null check is moved in the barrier to enable implicit null
42 // checks. The null check must not be moved arr.length
43 arr[i] = 0x42;
44 }
45
46 static public void main(String[] args) {
47 int[] int_arr = new int[10];
|