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Compiling real-time programs with timing constraint refinement and structural code motion

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2 Author(s)
Gerber, R. ; Dept. of Comput. Sci., Maryland Univ., College Park, MD, USA ; Seongsoo Hong

We present a programming language called TCEL (Time-Constrained Event Language), whose semantics are based on time-constrained relationships between observable events. Such a semantics infers only those timing constraints necessary to achieve real-time correctness, without overconstraining the system. Moreover, an optimizing compiler can exploit this looser semantics to help tune the code, so that its worst-case execution time is consistent with its real-time requirements. In this paper we describe such a transformation system, which works in two phases. First, the TCEL source code is translated into an intermediate representation. Then an instruction-scheduling algorithm rearranges selected unobservable operations and synthesizes tasks guaranteed to respect the original event-based constraints

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Software Engineering, IEEE Transactions on  (Volume:21 ,  Issue: 5 )