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  * @bug 8058897
  27  * @library /testlibrary
  28  * @modules java.base/sun.misc
  29  *          java.management
  30  * @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:MallocMaxTestWords=100m Reallocate
  31  */
  32 
  33 import com.oracle.java.testlibrary.*;
  34 import sun.misc.Unsafe;
  35 import static com.oracle.java.testlibrary.Asserts.*;
  36 
  37 public class Reallocate {
  38     public static void main(String args[]) throws Exception {
  39         Unsafe unsafe = Utils.getUnsafe();
  40 
  41         long address = unsafe.allocateMemory(1);
  42         assertNotEquals(address, 0L);
  43 
  44         // Make sure we reallocate correctly
  45         unsafe.putByte(address, Byte.MAX_VALUE);
  46         address = unsafe.reallocateMemory(address, 2);
  47         assertNotEquals(address, 0L);
  48         assertEquals(unsafe.getByte(address), Byte.MAX_VALUE);
  49 
  50         // Reallocating with a 0 size should return a null pointer
  51         address = unsafe.reallocateMemory(address, 0);
  52         assertEquals(address, 0L);
  53 
  54         // Reallocating with a null pointer should result in a normal allocation
  55         address = unsafe.reallocateMemory(0L, 1);

  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  * @bug 8058897
  27  * @library /testlibrary
  28  * @modules java.base/sun.misc
  29  *          java.management
  30  * @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:MallocMaxTestWords=100m Reallocate
  31  */
  32 
  33 import jdk.test.lib.*;
  34 import sun.misc.Unsafe;
  35 import static jdk.test.lib.Asserts.*;
  36 
  37 public class Reallocate {
  38     public static void main(String args[]) throws Exception {
  39         Unsafe unsafe = Utils.getUnsafe();
  40 
  41         long address = unsafe.allocateMemory(1);
  42         assertNotEquals(address, 0L);
  43 
  44         // Make sure we reallocate correctly
  45         unsafe.putByte(address, Byte.MAX_VALUE);
  46         address = unsafe.reallocateMemory(address, 2);
  47         assertNotEquals(address, 0L);
  48         assertEquals(unsafe.getByte(address), Byte.MAX_VALUE);
  49 
  50         // Reallocating with a 0 size should return a null pointer
  51         address = unsafe.reallocateMemory(address, 0);
  52         assertEquals(address, 0L);
  53 
  54         // Reallocating with a null pointer should result in a normal allocation
  55         address = unsafe.reallocateMemory(0L, 1);