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 jdk.internal;
  27 
  28 import java.lang.annotation.*;
  29 
  30 /**
  31  * The {@code @HotSpotIntrinsicCandidate} annotation is specific to the Oracle Java
  32  * HotSpot Virtual Machine implementation and indicates that an annotated method
  33  * may be (but is not guaranteed to be) intrinsified by the HotSpot VM. A method
  34  * is intrinsified if the HotSpot VM replaces the annotated method with hand-written
  35  * assembly and/or hand-written compiler IR -- a compiler intrinsic -- to improve
  36  * performance. The {@code @HotSpotIntrinsicCandidate} annotation is internal to the
  37  * Java libraries and is therefore not supposed to have any relevance for application
  38  * code.
  39  *
  40  * Maintainers of the Java libraries must consider the following when
  41  * modifying methods annotated with {@code @HotSpotIntrinsicCandidate}.
  42  *
  43  * <ul>
  44  * <li>When modifying a method annotated with {@code @HotSpotIntrinsicCandidate},
  45  * the corresponding intrinsic code in the HotSpot VM implementation must be
  46  * updated to match the semantics of the annotated method.</li>
  47  * <li>For some annotated methods, the corresponding intrinsic may omit some low-level
  48  * checks that would be performed as a matter of course if the intrinsic is implemented
  49  * using Java bytecodes. This is because individual Java bytecodes implicitly check
  50  * for exceptions like {@code NullPointerException} and {@code ArrayStoreException}.
  51  * If such a method is replaced by an intrinsic coded in assembly language, any
  52  * checks performed as a matter of normal bytecode operation must be performed

  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 jdk.internal;
  27 
  28 import java.lang.annotation.*;
  29 
  30 /**
  31  * The {@code @HotSpotIntrinsicCandidate} annotation is specific to the
  32  * HotSpot Virtual Machine. It indicates that an annotated method
  33  * may be (but is not guaranteed to be) intrinsified by the HotSpot VM. A method
  34  * is intrinsified if the HotSpot VM replaces the annotated method with hand-written
  35  * assembly and/or hand-written compiler IR -- a compiler intrinsic -- to improve
  36  * performance. The {@code @HotSpotIntrinsicCandidate} annotation is internal to the
  37  * Java libraries and is therefore not supposed to have any relevance for application
  38  * code.
  39  *
  40  * Maintainers of the Java libraries must consider the following when
  41  * modifying methods annotated with {@code @HotSpotIntrinsicCandidate}.
  42  *
  43  * <ul>
  44  * <li>When modifying a method annotated with {@code @HotSpotIntrinsicCandidate},
  45  * the corresponding intrinsic code in the HotSpot VM implementation must be
  46  * updated to match the semantics of the annotated method.</li>
  47  * <li>For some annotated methods, the corresponding intrinsic may omit some low-level
  48  * checks that would be performed as a matter of course if the intrinsic is implemented
  49  * using Java bytecodes. This is because individual Java bytecodes implicitly check
  50  * for exceptions like {@code NullPointerException} and {@code ArrayStoreException}.
  51  * If such a method is replaced by an intrinsic coded in assembly language, any
  52  * checks performed as a matter of normal bytecode operation must be performed