Abstract
This paper presents SymRT, a tool based on a combination of symbolic execution and real-time model checking for timing analysis of Java systems. Symbolic execution is used for the generation of a safe and tight timing model of the analyzed system capturing the feasible execution paths. The model is combined with suitable execution environment models capturing the timing behavior of the target host platform including the Java virtual machine and complex hardware features such as caching. The complete timing model is a network of timed automata which directly facilitates safe estimates of worst and best case execution time to be determined using the Uppaal model checker. Furthermore, the integration of the proposed techniques into the TetaSARTS tool facilitates reasoning about additional timing properties such as the schedulability of periodically and sporadically released Java real-time tasks (under specific scheduling policies), worst case response time, and more.
Highlights
Rigorous verification is essential for safety critical embedded hard real-time systems needing to comply with tight timing constraints
1.2 Contributions In this paper, we present a combination of symbolic execution [26, 27] and real-time model checking that generates a precise control-flow model from the symbolic execution trees obtained with a symbolic execution of the program
5 Experimental results We first introduce a comparison of the WCET and BCET estimates obtained from SYMRT and the state-of-the-art in execution time analysis for Java real-time systems
Summary
Rigorous verification is essential for safety critical embedded hard real-time systems needing to comply with tight timing constraints. Several analysis tools for SCJ have been put forward including WCA [22], SARTS [23], TetaJ [24], and TETASARTS [25] Characteristic for these is that they rely on reconstruction of the control-flow graph (CFG), which characterizes all possible execution paths of the program. SYMRT is used for automatically constructing a complete timing model of Java real-time systems written in a variant of the SCJ profile. This model is built on a per-task basis using JPF-SYMBC-RT, taking into account possible interference from other tasks.
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