Results 1  10
of
10
Modeling and Verifying Systems using a Logic of Counter Arithmetic with Lambda Expressions and Uninterpreted Functions
, 2002
"... In this paper, we present the logic of Counter arithmetic with Lambda expressions and Uninterpreted functions (CLU). CLU generalizes the logic of equality with uninterpreted functions (EUF) with constrained lambda expressions, ordering, and successor and predecessor functions. In addition to mod ..."
Abstract

Cited by 142 (42 self)
 Add to MetaCart
In this paper, we present the logic of Counter arithmetic with Lambda expressions and Uninterpreted functions (CLU). CLU generalizes the logic of equality with uninterpreted functions (EUF) with constrained lambda expressions, ordering, and successor and predecessor functions. In addition to modeling pipelined processors that EUF has proved useful for, CLU can be used to model many infinitestate systems including those with infinite memories, finite and infinite queues including lossy channels, and networks of identical processes. Even with this richer expressive power, the validity of a CLU formula can be efficiently decided by translating it to a propositional formula, and then using Boolean methods to check validity. We give theoretical and empirical evidence for the efficiency of our decision procedure. We also describe verification techniques that we have used on a variety of systems, including an outoforder execution unit and the loadstore unit of an industrial microprocessor.
How to compose PresburgerAccelerations: Applications to Broadcast Protocols
 IN PROC. 22ND CONF. FOUND. OF SOFTWARE TECHNOLOGY AND THEOR. COMP. SCI. (FST&TCS'2002), KANPUR
, 2002
"... Finite linear systems are finite sets of linear functions whose guards are de fined by Presburger formulas, and whose the squares matrice associated generate a finite multiplicative monoid. We prove that for finite linear systems, the accelerations of sequences of transitions always produce an effec ..."
Abstract

Cited by 48 (17 self)
 Add to MetaCart
Finite linear systems are finite sets of linear functions whose guards are de fined by Presburger formulas, and whose the squares matrice associated generate a finite multiplicative monoid. We prove that for finite linear systems, the accelerations of sequences of transitions always produce an effective Presburgerdefinable relation. We then show how to choose the good sequences of length n whose number is polynomial in n although the total number of cycles of length n is exponential in n. We implement these theoretical results in the tool FAST [FAS] (Fast Acceleration of Symbolic Transition systems). FAST computes in few seconds the minimal deterministic finite automata that represent the reachability sets of 8 wellknown broadcast protocols.
Regular Model Checking made Simple and Efficient
"... We present a new technique for computing the transitive closure of a regular relation characterized by a finitestate transducer. The construction starts from the original transducer, and repeatedly adds new transitions which are compositions of currently existing transitions. ..."
Abstract

Cited by 22 (12 self)
 Add to MetaCart
We present a new technique for computing the transitive closure of a regular relation characterized by a finitestate transducer. The construction starts from the original transducer, and repeatedly adds new transitions which are compositions of currently existing transitions.
Iterating Transducers
, 2001
"... Regular languages have proved useful for the symbolic state exploration of infinite state systems. They can be used to represent infinite sets of system configurations; the transitional semantics of the system consequently can be modeled by finitestate transducers. A standard problem encountered ..."
Abstract

Cited by 21 (0 self)
 Add to MetaCart
Regular languages have proved useful for the symbolic state exploration of infinite state systems. They can be used to represent infinite sets of system configurations; the transitional semantics of the system consequently can be modeled by finitestate transducers. A standard problem encountered when doing symbolic state exploration for infinite state systems is how to explore all states in a finite amount of time. When representing the onestep transition relation of a system by a finitestate transducer T , this problem boils down to finding an appropriate finitestate representation T for its transitive closure. In this
Parameterized Reachability Analysis of the IEEE 1394 Root Contention Protocol using TReX
 PROCEEDINGS OF THE WORKSHOP ON REALTIME TOOLS (RTTOOLS'2001)
, 2001
"... We report about the reachability analysis of fully parametrized models of the IEEE 1394 root contention protocol. This protocol uses timing constraints in order to elect a leader. The interesting point is that the timing constraints involve some parameters (transmission delay, bounds of waiting i ..."
Abstract

Cited by 14 (0 self)
 Add to MetaCart
We report about the reachability analysis of fully parametrized models of the IEEE 1394 root contention protocol. This protocol uses timing constraints in order to elect a leader. The interesting point is that the timing constraints involve some parameters (transmission delay, bounds of waiting intervals), and the behavior of the protocol strongly depends on the relation between these parameters. In order to synthesize the relation ensuring the correct behavior of the protocol, we apply the symbolic reachability techniques implemented in the TReX tool. We take the unparameterized model of Root Contention protocol proposed in [24] and study different parametrized versions of this model. We are able to synthesize automatically all the relations already found by proof or experiments on the unparameterized versions. We compare our results with those reported or obtained using other tools for parametrized systems.
A Transformational Approach for Generating NonLinear Invariants
 IN STATIC ANALYSIS SYMPOSIUM (JUNE 2000
, 2000
"... Computing invariants is the key issue in the analysis of infinitestate systems whether analysis means testing, verification or parameter synthesis. In particular, methods that allow to treat combinations of loops are of interest. We present a set of algorithms and methods that can be applied to cha ..."
Abstract

Cited by 5 (0 self)
 Add to MetaCart
Computing invariants is the key issue in the analysis of infinitestate systems whether analysis means testing, verification or parameter synthesis. In particular, methods that allow to treat combinations of loops are of interest. We present a set of algorithms and methods that can be applied to characterize overapproximations of the set of reachable states of combinations of selfloops. We present two families of complementary techniques. The first one identifies a number of basic cases of pair of selfloops for which we provide an exact characterization of the reachable states. The second family of techniques is a set of rules based on static analysis that allow to reduce n selfloops (n 2) to n  1 independent pairs of selfloops. The results of the analysis of the pairs of selfloops can then be combined to provide an overapproximation of the reachable states of the n selfloops. We illustrate our methods by synthesizing conditions under which the Biphase Mark protocol works proper...
Bisimulation and other undecidable equivalences for lossy channel systems
 In Proc. of TACS’01, volume 2215 of LNCS
, 2001
"... Abstract. Lossy channel systems are systems of finite state automata that communicate via unreliable unbounded fifo channels. Today the main open question in the theory of lossy channel systems is whether bisimulation is decidable. We show that bisimulation, simulation, and in fact all relations bet ..."
Abstract

Cited by 5 (0 self)
 Add to MetaCart
Abstract. Lossy channel systems are systems of finite state automata that communicate via unreliable unbounded fifo channels. Today the main open question in the theory of lossy channel systems is whether bisimulation is decidable. We show that bisimulation, simulation, and in fact all relations between bisimulation and trace inclusion are undecidable for lossy channel systems (and for lossy vector addition systems). 1
Iterating Transducers for Safety of DataAbstractions
, 2000
"... Regular languages have proved useful for the symbolic state exploration of infinite state systems. Regular languages can be used to represent infinite sets of system configurations, the transitional semantics of the system consequently can be modeled by finitestate transducers. A standard problem e ..."
Abstract

Cited by 1 (0 self)
 Add to MetaCart
Regular languages have proved useful for the symbolic state exploration of infinite state systems. Regular languages can be used to represent infinite sets of system configurations, the transitional semantics of the system consequently can be modeled by finitestate transducers. A standard problem encountered when doing symbolic state exploration for in nite state systems is, how to explore all states in a finite amount of time. When representing the onestep transition relation of a system by a finitestate transducer T , this problem boils down to finding a finitestate representation for T , capturing the transitive closure of the onestep reduction relation. In this paper we give a semialgorithm to compute T . The construction is based on building a quotient of an infinitestate representation, where the quotienting uses past and future bisimulations computed on finite approximations of T . As in general, T is not representable by a finitestate transducer, the constructi...
Downward Closed Language Generators
"... We use downward closed languages for representing sets of states when performing forward reachability analysis on infinitestate systems. Downward closed languages are often more succinct than exact representations of the set of reachable states. We introduce a formalism for representing downward cl ..."
Abstract
 Add to MetaCart
We use downward closed languages for representing sets of states when performing forward reachability analysis on infinitestate systems. Downward closed languages are often more succinct than exact representations of the set of reachable states. We introduce a formalism for representing downward closed languages, called downward closed language generators (dlgs).
Polynomial Time Image Computation with Intervaldefinable Counters Systems
, 2004
"... this article weshow that for any counters systems, the computation is polynomial ..."
Abstract
 Add to MetaCart
this article weshow that for any counters systems, the computation is polynomial