arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1910.08992cs.FLcs.LO
收藏

用有界区域历史图检验时间互模拟--技术报告

Checking Timed Bisimulation with Bounded Zone-History Graphs -- Technical Report

Lars Luthmann, Hendrik Göttmann, Isabelle Bacher, Malte Lochau

摘要:

时间自动机(TA)是一个行之有效的形式化描述离散状态/连续时间行为的时间临界反应系统。关于基本分析问题的候选人的实现对规范进行比较,都给定为TA,它已被证明,定时跟踪等价是不可判定的,而定时互模拟等价是可判定的。相应的证明利用区域图,一个有限的,但通常非常占用空间的TA语义表征。因此,大多数实用的TA工具利用区域图,而不是符号和一般更有效的表示TA语义,自动化分析任务。然而,区域图只产生声音的分析任务的结果被简化为平原可达性问题,从而检查定时双相似性太不精确。在本文中,我们提出了有界区域历史图,一种新的表征TA语义促进可调的权衡精度和可扩展性之间的时间双相似性检查。据我们所知,我们的工具TimBrCheck是目前唯一可用的工具,用于有效地检查定时双相似性,甚至支持无声移动的非确定性TA。我们进一步提出了实验结果,从应用我们的工具收集的社区基准,提供洞察精度和效率之间的权衡,取决于绑定值。

英文摘要:

Timed automata (TA) are a well-established formalism for specifying discrete-state/continuous-time behavior of time-critical reactive systems. Concerning the fundamental analysis problem of comparing a candidate implementation against a specification, both given as TA, it has been shown that timed trace equivalence is undecidable, whereas timed bisimulation equivalence is decidable. The corresponding proof utilizes region graphs, a finite, but generally very space-consuming characterization of TA semantics. Hence, most practical TA tools utilize zone graphs instead, a symbolic and generally more efficient representation of TA semantics, to automate analysis tasks. However, zone graphs only produce sound results for analysis tasks being reducible to plain reachability problems thus being too imprecise for checking timed bisimilarity. In this paper, we propose bounded zone-history graphs, a novel characterization of TA semantics facilitating an adjustable trade-off between precision and scalability of timed-bisimilarity checking. Our tool TimBrCheck is, to the best of our knowledge, the only currently available tool for effectively checking timed bisimilarity and even supports non-deterministic TA with silent moves. We further present experimental results gained from applying our tool to a collection of community benchmarks, providing insights into trade-offs between precision and efficiency, depending on the bound value.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑