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 NullCheckDroppingsTest
  26  * @bug 8054492
  27  * @summary Casting can result in redundant null checks in generated code
  28  * @requires vm.flavor == "server"
  29  * @library /testlibrary /test/lib
  30  * @modules java.base/jdk.internal.misc
  31  *          java.management
  32  *
  33  * @build ClassFileInstaller sun.hotspot.WhiteBox jdk.test.lib.*
  34  * @build compiler.intrinsics.klass.CastNullCheckDroppingsTest
  35  * @run driver ClassFileInstaller sun.hotspot.WhiteBox
  36  *                                sun.hotspot.WhiteBox$WhiteBoxPermission
  37  *                                jdk.test.lib.Platform
  38  * @run main/othervm -Xbootclasspath/a:. -XX:+IgnoreUnrecognizedVMOptions -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI
  39  *                   -Xmixed -XX:-BackgroundCompilation -XX:-TieredCompilation -XX:CompileThreshold=1000
  40  *                   -XX:CompileCommand=exclude,compiler.intrinsics.klass.CastNullCheckDroppingsTest::runTest
  41  *                   compiler.intrinsics.klass.CastNullCheckDroppingsTest
  42  */
  43 
  44 package compiler.intrinsics.klass;
  45 
  46 import jdk.test.lib.Platform;
  47 import sun.hotspot.WhiteBox;
  48 import sun.hotspot.code.NMethod;
  49 
  50 import java.lang.invoke.MethodHandle;
  51 import java.lang.invoke.MethodHandles;
  52 import java.lang.invoke.MethodType;
  53 import java.lang.reflect.Method;
  54 import java.util.function.BiFunction;
  55 
  56 public class CastNullCheckDroppingsTest {
  57 

   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 NullCheckDroppingsTest
  26  * @bug 8054492
  27  * @summary Casting can result in redundant null checks in generated code
  28  * @requires vm.flavor == "server"
  29  * @library /test/lib
  30  * @modules java.base/jdk.internal.misc
  31  *          java.management
  32  *
  33  * @build sun.hotspot.WhiteBox

  34  * @run driver ClassFileInstaller sun.hotspot.WhiteBox
  35  *                                sun.hotspot.WhiteBox$WhiteBoxPermission

  36  * @run main/othervm -Xbootclasspath/a:. -XX:+IgnoreUnrecognizedVMOptions -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI
  37  *                   -Xmixed -XX:-BackgroundCompilation -XX:-TieredCompilation -XX:CompileThreshold=1000
  38  *                   -XX:CompileCommand=exclude,compiler.intrinsics.klass.CastNullCheckDroppingsTest::runTest
  39  *                   compiler.intrinsics.klass.CastNullCheckDroppingsTest
  40  */
  41 
  42 package compiler.intrinsics.klass;
  43 
  44 import jdk.test.lib.Platform;
  45 import sun.hotspot.WhiteBox;
  46 import sun.hotspot.code.NMethod;
  47 
  48 import java.lang.invoke.MethodHandle;
  49 import java.lang.invoke.MethodHandles;
  50 import java.lang.invoke.MethodType;
  51 import java.lang.reflect.Method;
  52 import java.util.function.BiFunction;
  53 
  54 public class CastNullCheckDroppingsTest {
  55