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Eldarica is a model checker for Horn clauses, Numerical Transition Systems, and software programs. Inputs can be read in a variety of formats, including SMT-LIB 2 and Prolog for Horn clauses, and fragments of Scala and C for software programs, and are analysed using a variant of the Counterexample-Guided Abstraction Refinement (CEGAR) method. Eldarica is fast and includes sophisticated interpolation-based techniques for synthesising new predicates for CEGAR, enabling it to solve a wide range of verification problems.

The Eldarica C parser accepts programs augmented with various primitives from the timed automata world: supporting concurrency, clocks, communication channels, as well as analysis of systems with an unbounded number of processes (parameterised analysis).

There is also a variant of Eldarica for analysing Petri nets:

Eldarica has been developed by Hossein Hojjat and Philipp Ruemmer, with further contributions by Zafer Esen, Filip Konecny, and Pavle Subotic.

There is a simple web interface to experiment with the C interface of Eldarica:

The latest nightly build is available from:


You can either download a binary release of Eldarica, or compile the Scala code yourself. Since Eldarica uses sbt, compilation is quite simple: you just need sbt installed on your machine, and then type sbt assembly to download the compiler, all required libraries, and produce a binary of Eldarica.

After compilation (or downloading a binary release), calling Eldarica is normally as easy as saying

./eld regression-tests/horn-smt-lib/rate_limiter.c.nts.smt2

When using a binary release, one can instead also call

java -jar target/scala-2.*/Eldarica-assembly*.jar regression-tests/horn-smt-lib/rate_limiter.c.nts.smt2

A set of examples is provided on, and included in the distributions directory regression-tests.

You can use the script eld-client instead of eld in order to run Eldarica in a server-client mode, which significantly speeds up processing of multiple problems.

A full list of options can be obtained by calling ./eld -h.
In particular, the options -disj, -abstract, -stac can be used to control predicate generation.


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