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/**
* This interface contains shareable instruction objects.
*
* In order to save memory you can use some instructions multiply,
* since they have an immutable state and are directly derived from
* Instruction. I.e. they have no instance fields that could be
* changed. Since some of these instructions like ICONST_0 occur
* very frequently this can save a lot of time and space. This
* feature is an adaptation of the FlyWeight design pattern, we
* just use an array instead of a factory.
*
* The Instructions can also accessed directly under their names, so
* it's possible to write il.append(Instruction.ICONST_0);
*
* @author <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A>
*/
public interface InstructionConstants {
/** Predefined instruction objects
*/
/** You can use these constants in multiple places safely, if you can guarantee
* that you will never alter their internal values, e.g. call setIndex().
*/
/** Get object via its opcode, for immutable instructions like
* branch instructions entries are set to null.
*/
/** Interfaces may have no static initializers, so we simulate this
* with an inner class.
*/
static class Clinit {
Clinit() {
}
}
}