How to use

create

method

in

com.oracle.truffle.api.profiles.ValueProfile$ExactClass

/**
 * <p>
 * Returns a value profile that profiles the exact class of a value. It will check the class of
 * the profiled value and provide additional information to the compiler if only non-null values
 * of exactly one concrete Java class are passed as a parameter to the
 * {@link ValueProfile#profile} method. This can be beneficial if subsequent code can take
 * advantage of knowing the concrete class of the value. The profile will degrade to the generic
 * case if a null value or if at least two instances of two different Java classes are
 * registered.
 * </p>
 *
 * <p>
 * <b>Compilation notes:</b> Value profiles require a runtime check in their initialized state
 * to verify their profiled class. If two classes have been seen on a single profile instance
 * then this profile will transition to a generic state with no overhead.
 * </P>
 *
 * @see ValueProfile usage example
 * @since 0.10
 */
public static ValueProfile createClassProfile() {
  if (Profile.isProfilingEnabled()) {
    return ExactClass.create();
  } else {
    return Disabled.INSTANCE;
  }
}

/**
 * <p>
 * Returns a value profile that profiles the exact class of a value. It will check the class of
 * the profiled value and provide additional information to the compiler if only non-null values
 * of exactly one concrete Java class are passed as a parameter to the
 * {@link ValueProfile#profile} method. This can be beneficial if subsequent code can take
 * advantage of knowing the concrete class of the value. The profile will degrade to the generic
 * case if a null value or if at least two instances of two different Java classes are
 * registered.
 * </p>
 *
 * <p>
 * <b>Compilation notes:</b> Value profiles require a runtime check in their initialized state
 * to verify their profiled class. If two classes have been seen on a single profile instance
 * then this profile will transition to a generic state with no overhead.
 * </P>
 *
 * @see ValueProfile usage example
 * @since 0.10
 */
public static ValueProfile createClassProfile() {
  if (Profile.isProfilingEnabled()) {
    return ExactClass.create();
  } else {
    return Disabled.INSTANCE;
  }
}