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package java.dyn;

/**
 * {@code InvokeDynamic} is a class with neither methods nor instances,
 * which serves only as a syntactic marker in Java source code for
 * an {@code invokedynamic} instruction.
 * (See <a href="package-summary.html#jvm_mods">the package information</a> for specifics on this instruction.)
 * <p>
 * The {@code invokedynamic} instruction is incomplete without a target method.
 * The target method is a property of the reified {@linkplain CallSite call site object}
 * which is linked to each active {@code invokedynamic} instruction.
 * The call site object is initially produced by a
 * {@linkplain BootstrapMethod bootstrap method}
 * associated with the class whose bytecodes include the dynamic call site.
 * <p>
 * The type {@code InvokeDynamic} has no particular meaning as a
 * class or interface supertype, or an object type; it can never be instantiated.
 * Logically, it denotes a source of all dynamically typed methods.
 * It may be viewed as a pure syntactic marker of static calls.
 * It may be imported for ease of use.
 * <p>
 * Here are some examples:
<blockquote><pre><!-- see indy-demo/src/JavaDocExamples.java -->
&#064;BootstrapMethod(value=Here.class, name="bootstrapDynamic")
static void example() throws Throwable {
    Object x; String s; int i;
    x = InvokeDynamic.greet("world"); // greet(Ljava/lang/String;)Ljava/lang/Object;
    s = (String) InvokeDynamic.hail(x); // hail(Ljava/lang/Object;)Ljava/lang/String;
    InvokeDynamic.cogito(); // cogito()V
    i = (int) InvokeDynamic.#"op:+"(2, 3); // "op:+"(II)I
}
static MethodHandle bootstrapDynamic(Class caller, String name, MethodType type) { ... }
</pre></blockquote>
 * Each of the above calls generates a single invokedynamic instruction
 * with the name-and-type descriptors indicated in the comments.
 * <p>
 * The argument types are taken directly from the actual arguments,
 * while the return type corresponds to the target of the assignment.
 * (Currently, the return type must be given as a false type parameter.
 * This type parameter is an irregular use of the generic type syntax,
 * and is likely to change in favor of a convention based on target typing.)
 * <p>
 * The final example uses a special syntax for uttering non-Java names.
 * Any name legal to the JVM may be given between the double quotes.
 * <p>
 * None of these calls is complete without a bootstrap method,
 * which must be declared for the enclosing class or method.
 * @author John Rose, JSR 292 EG
 */
@MethodHandle.PolymorphicSignature
public final class InvokeDynamic {
    private InvokeDynamic() { throw new InternalError(); }  // do not instantiate

    // no statically defined static methods
}