CoreIR Symbolic Analyzer
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Latest commit 1060ad8 Nov 2, 2018


CoSA: CoreIR Symbolic Analyzer SMT-based symbolic model checker for hardware design.


CoSA supports a variety of input formats:

  • CoreIR
  • BTOR2
  • Verilog
  • SystemVerilog
  • Symbolic Transition System (STS)
  • Explicit states Transition System (ETS)

and verifications:

  • Invariant Properties
  • Linear Temporal Logic (LTL) Properties
  • Proving capabilities
  • Equivalence Checking
  • Parametric (Invariant) Model Checking
  • Fault Analysis
  • Automated Lemma Extraction


  1. pip3 install cosa to install CoSA, and its dependencies i.e., PySMT, PyCoreIR, and PyVerilog
  2. pysmt-install --msat to install MathSAT5 solver (it provides interpolation support), or pysmt-install --cvc4 for CVC4 and pysmt-install --z3 for Z3
  3. pysmt-install --env to show the environment variables that need to be exported

Software requirements:

  • CoreIR needs to be installed in order to support CoreIR as input format
  • Icarus Verilog needs to be installed in order to support Verilog as input format
  • Verific binaries (i.e., verific) and Icarus Verilog need to be installed in order to support SystemVerilog as input format


To start playing with the tool, you can run:

  1. CoSA -h shows the helper with command options
  2. CoSA -i examples/counters/counters.json --simulate -k 7 generates a system execution with depth 7
  3. CoSA -i examples/counters/counters.json --safety -p "!(count0.a.out = 5_16)" -k 7 performs reachability model checking with property count0.a.out != 5 as a 16-bit Bitvector
  4. CoSA --problem examples/counter/problem.txt --prefix trace performs liveness (GF) and finally (F) checking on the counter.json model using the problem definition
  5. CoSA --problem examples/fold-constants/problem.txt performs equivalence checking using lemmas

For more information, please refer to the CoSA user manual.


  1. install Docker with your package manager e.g., sudo apt-get install docker
  2. build the Docker image: cd docker/ubuntu_1604 && docker build -t ubuntu-cosa .
  3. run the Docker image: docker run -i -t ubuntu-cosa /bin/bash


  • pip3 install -e . to install CoSA from the source
  • nosetests tests to run the tests


CoSA is released under the modified BSD (3-clause BSD) License.

If you use CoSA in your work, please consider citing the following publication:

   author    = {Cristian Mattarei and
               Makai Mann and
               Clark Barrett and
               Ross G. Daly and
               Dillon Huff and
               Pat Hanrahan},
  title     = {{CoSA: Integrated Verification for Agile Hardware Design}},
  booktitle = {Formal Methods in Computer-Aided Design, {FMCAD} 2018, Austin, Texas,
               USA, October 30 - November 2, 2018.},
  publisher = {{IEEE}},
  year      = {2018}

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