![]() ![]() Some transition systems with invariant properties can be found here. Horn2vmt, a tool for translating Horn reachability into transition systems.IC3ia, an open-source implementation of infinite-state IC3 with implicit predicate abstraction.From nuXmv to VMT: the nuXmv model checker provides a write_vmt_model command.Alternatively, there is another translator (also called horn2vmt) available on GitHub. From Constrained Horn Clauses to VMT: there’s an horn2vmt tool that comes with the IC3ia model checker.ltl2vmt.py: a tool to convert a :ltl-property into a :live-property specification (by compiling them into symbolic tableaux which are then put in product with the transition system).vmt2nuxmv.py: converter from VMT to the SMV dialect of nuXmv.vmt2horn.py: converter from VMT to Constrained Horn Clauses.btor2vmt.py: converter from BTOR to VMT.vmt2btor.py: converter from VMT to the BTOR2 format.vmt.py: parsing and printing of transition systems in the VMT format.Currently, the following tools are provided: Vmt-tools is a collection of tools for working with the VMT format. VMT-LIB Syntax and Semantics Specification, Version 0.1 Tool Support ![]() In the future, the VMT-LIB initiative will result in a collection of model checking benchmarks for infinite-state transition systems, and in pyVMT, a toolset based on extensions of the pySMT library. sv0 in the example above that introduces the relation between x and xn Since the SMT2 format (and thus also the VMT one that inherits from SMT2) does not allow to annnotate the declaration of variables, it is a good practice to insert immediately after the declaration of the variables a set of defines to specify the relations among variables. ![]() The following example shows a simple NUXMV model and its corresponding VMT translation. Moreover, only the following commands are allowed to occur in VMT files: set-logic, set-option, declare-sort, define-sort, declare-fun, define-fun (For convenience, an additional ( assert true) command is allowed to appear at the end of the file). In a VMT file, only annotated terms and their sub-terms are meaningful. The non-negative integer idx is a unique identifier for the property. :live-property idx is used to specify an LTL property of the form F Gp, where p is the formula annotated with :live-property.formulas of the form Gp, where p is the formula annotated with :invar-property. :invar-property idx is used to specify invariant properties, i.e.:trans true is used to specify the formula for the transition relation.(The “dummy” value true in the annotation is needed because the current SMT2 standard requires annotations to always have an associated value.) This formula should contain neither next-state variables nor input variables. :init true is used to specify the formula for the initial states of the model.All the variables that are not in relation with another by means of a :next attribute are considered inputs. The two variables are linked by annotating x c with the attribute :next x n. For each variable x in the model, the VMT file contains a pair of variables, x c and x n, representing respectively the current and next version of x. :next name is used to represent state variables.VMT exploits the capability offered by the SMT2 language of attaching annotations to terms and formulas in order to specify the components of the transition system and the properties to verify. More specifically, the following annotations are used: The VMT format is an extension of the SMT-LIBv2 (SMT2 for short) format to represent symbolic transition systems. Since then, a format has been defined (see definition of the VMT format in the nuXmv manual, page 130), and is now supported by the the nuXmv model checker. Verification Modulo Theories was originally proposed in the Rich-Model Toolkit meeting held in Turin in 2011 (see slides below). ![]()
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