src/java.base/share/classes/sun/reflect/UnsafeFieldAccessorImpl.java

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rev 12972 : 8140606: Update library code to use internal Unsafe
Reviewed-by: duke


  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package sun.reflect;
  27 
  28 import java.lang.reflect.Field;
  29 import java.lang.reflect.Modifier;
  30 import sun.misc.Unsafe;
  31 
  32 /** Base class for sun.misc.Unsafe-based FieldAccessors. The
  33     observation is that there are only nine types of fields from the
  34     standpoint of reflection code: the eight primitive types and
  35     Object. Using class Unsafe instead of generated bytecodes saves
  36     memory and loading time for the dynamically-generated
  37     FieldAccessors. */
  38 
  39 abstract class UnsafeFieldAccessorImpl extends FieldAccessorImpl {
  40     static final Unsafe unsafe = Unsafe.getUnsafe();
  41 
  42     protected final Field   field;
  43     protected final long    fieldOffset;
  44     protected final boolean isFinal;
  45 
  46     UnsafeFieldAccessorImpl(Field field) {
  47         this.field = field;
  48         if (Modifier.isStatic(field.getModifiers()))
  49             fieldOffset = unsafe.staticFieldOffset(field);
  50         else
  51             fieldOffset = unsafe.objectFieldOffset(field);
  52         isFinal = Modifier.isFinal(field.getModifiers());




  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package sun.reflect;
  27 
  28 import java.lang.reflect.Field;
  29 import java.lang.reflect.Modifier;
  30 import jdk.internal.misc.Unsafe;
  31 
  32 /** Base class for jdk.internal.misc.Unsafe-based FieldAccessors. The
  33     observation is that there are only nine types of fields from the
  34     standpoint of reflection code: the eight primitive types and
  35     Object. Using class Unsafe instead of generated bytecodes saves
  36     memory and loading time for the dynamically-generated
  37     FieldAccessors. */
  38 
  39 abstract class UnsafeFieldAccessorImpl extends FieldAccessorImpl {
  40     static final Unsafe unsafe = Unsafe.getUnsafe();
  41 
  42     protected final Field   field;
  43     protected final long    fieldOffset;
  44     protected final boolean isFinal;
  45 
  46     UnsafeFieldAccessorImpl(Field field) {
  47         this.field = field;
  48         if (Modifier.isStatic(field.getModifiers()))
  49             fieldOffset = unsafe.staticFieldOffset(field);
  50         else
  51             fieldOffset = unsafe.objectFieldOffset(field);
  52         isFinal = Modifier.isFinal(field.getModifiers());