|in Proceedings of Re ection'96, pp.79{91| Implementing Parallel Language Constructs Using a Re ective Object-Oriented Language

To provide various parallel language constructs, ex-tensible languages based on re ection are attrac-tive for both implementors and users. This paper describes our proposed meta-level architecture of a concurrent object-oriented language ABCL/R3, which has the following characteristics: (1) lan-guage customization through meta-interpreters and meta-objects, (2) delegation and inheritance mech-anisms facilitating modular and re-usable meta-level programming, and (3) the re ective annota-tions and meta-level arguments realizing separation of base- and meta-level programs. We also show that several meta-level programs that provide com-mon parallel programming strategies, such as ob-ject replication and latency hiding, are easily im-plemented. 1 Parallel Languages and Re ec-tion Practical parallel and distributed programs often have complicated computation and communication structures for achieving eciency. For example, la-tency hiding|which is an optimization technique for remote messages|makes programs complicated because a thread of control must be deliberately `broken up ' into multiple process. To alleviate thi