A Transformation Method for Temporal Dynamic Pushdown Networks

Abstract

The invention discloses a time dynamic push-down network conversion method, which is used to describe real-time concurrent recursive modeling including recursion and dynamic thread creation. Firstly, a global clock that describes continuous time and a real-number clock that can describe the "age" of time-related global variables and stack characters are introduced in DPN, so that asynchronous communication based on shared memory and real-time concurrent system with dynamic thread creation can be implemented. for modeling. Secondly, for the clock equivalence technology based on integer division, an optimization technology based on clock key points is given to reduce the clock interval, thereby reducing the converted state space. Since the time dynamic pushdown network is an abstract model of a real-time concurrent recursive program, the clock equivalent optimization technology based on key points converts the model into a dynamic pushdown network, so that by confirming whether the execution of the dynamic pushdown network model will run to Error status to detect bugs or vulnerabilities in the concurrent recursive program corresponding to this model.

Description

technical field [0001] The invention belongs to the field of software security and reliability research, relates to a verification method for a multi-threaded concurrent recursive program, is a reachability solution technology applicable to an abstract model of a multi-threaded concurrent recursive program containing time, and specifically relates to a time dynamic The transformation method for the pushdown network. Background technique [0002] With the development of multi-core technology, concurrent programs have become a hot spot in current program design research. Due to the uncertainty of concurrent execution, it is difficult for traditional testing methods to find hidden errors and loopholes in programs. Model checking is an automatic verification technology through exhaustive search, which has become an important means to ensure the safety and reliability of programs, and can be used as a supplement to testing methods. Reachability analysis is an important core tec...

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Problems solved by technology

[0004] Since the above model cannot describe the interaction between threads in a real-time multi-threaded concurrent recursive system, for real-time multi-threaded concurrent recursive programs, the formal verification of such programs will cause the problem of state space explosion, which brings great difficulties to the verification

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