src/java.base/share/classes/java/lang/invoke/SwitchPoint.java

rev 12617 : [mq]: 8134356-gt-lt-in-code

*** 81,113 ****
   * <p style="font-size:smaller;">
   * <em>Implementation Note:</em>
   * A switch point behaves as if implemented on top of {@link MutableCallSite},
   * approximately as follows:
   * <blockquote><pre>{@code
! public class SwitchPoint {
!   private static final MethodHandle
!     K_true  = MethodHandles.constant(boolean.class, true),
!     K_false = MethodHandles.constant(boolean.class, false);
!   private final MutableCallSite mcs;
!   private final MethodHandle mcsInvoker;
!   public SwitchPoint() {
!     this.mcs = new MutableCallSite(K_true);
!     this.mcsInvoker = mcs.dynamicInvoker();
!   }
!   public MethodHandle guardWithTest(
!                 MethodHandle target, MethodHandle fallback) {
!     // Note:  mcsInvoker is of type ()boolean.
!     // Target and fallback may take any arguments, but must have the same type.
!     return MethodHandles.guardWithTest(this.mcsInvoker, target, fallback);
!   }
!   public static void invalidateAll(SwitchPoint[] spts) {
!     List&lt;MutableCallSite&gt; mcss = new ArrayList&lt;&gt;();
!     for (SwitchPoint spt : spts)  mcss.add(spt.mcs);
!     for (MutableCallSite mcs : mcss)  mcs.setTarget(K_false);
!     MutableCallSite.syncAll(mcss.toArray(new MutableCallSite[0]));
!   }
! }
   * }</pre></blockquote>
   * @author Remi Forax, JSR 292 EG
   */
  public class SwitchPoint {
      private static final MethodHandle
--- 81,113 ----
   * <p style="font-size:smaller;">
   * <em>Implementation Note:</em>
   * A switch point behaves as if implemented on top of {@link MutableCallSite},
   * approximately as follows:
   * <blockquote><pre>{@code
!  * public class SwitchPoint {
!  *     private static final MethodHandle
!  *         K_true  = MethodHandles.constant(boolean.class, true),
!  *         K_false = MethodHandles.constant(boolean.class, false);
!  *     private final MutableCallSite mcs;
!  *     private final MethodHandle mcsInvoker;
!  *     public SwitchPoint() {
!  *         this.mcs = new MutableCallSite(K_true);
!  *         this.mcsInvoker = mcs.dynamicInvoker();
!  *     }
!  *     public MethodHandle guardWithTest(
!  *             MethodHandle target, MethodHandle fallback) {
!  *         // Note:  mcsInvoker is of type ()boolean.
!  *         // Target and fallback may take any arguments, but must have the same type.
!  *         return MethodHandles.guardWithTest(this.mcsInvoker, target, fallback);
!  *     }
!  *     public static void invalidateAll(SwitchPoint[] spts) {
!  *         List<MutableCallSite> mcss = new ArrayList<>();
!  *         for (SwitchPoint spt : spts)  mcss.add(spt.mcs);
!  *         for (MutableCallSite mcs : mcss)  mcs.setTarget(K_false);
!  *         MutableCallSite.syncAll(mcss.toArray(new MutableCallSite[0]));
!  *     }
!  * }
   * }</pre></blockquote>
   * @author Remi Forax, JSR 292 EG
   */
  public class SwitchPoint {
      private static final MethodHandle