Monthly Downloads: 68
Programming language: Haskell
License: BSD 3-clause "New" or "Revised" License
Tags: Language     Embedded     Copilot    
Latest version: v2.1.1

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Build Status

STOP! The official Copilot repos are now at https://github.com/Copilot-Language/.

Copilot: a stream DSL

Copilot is a stream (i.e., infinite lists) domain-specific language (DSL) in Haskell that compiles into embedded C. Copilot is similar in spirit to languages like Lustre. Copilot contains an interpreter, multiple back-end compilers, and other verification tools.


Copilot is comprised of a number of sub-projects which are automatically installed when you install Copilot from Hackage, as described below. (These are tracked as Git submodules in Copilot.)

  • copilot-language The front-end of Copilot defining the user language.

  • copilot-libraries User-supplied libraries for Copilot, including linear-temporal logic, fault-tolerant voting, regular expressions, etc.

  • copilot-core The core language, which efficiently represents Copilot expressions. The core is only of interest to implementers wishing to add a new back-end to Copilot.

  • copilot-cbmc A tool to generate a driver using CBMC, a third-party tool (see Dependencies below) that proves that the code generated by different C back-ends is equivalent. Currently, this includes the C99 back-end and the SBV back-end.

  • copilot-c99 A back-end that translates to Atom to generate hard real-time C code.

Optionally, you may which also to install

  • copilot-sbv Another back-end that translates to SBV, using its code generator to generate hard real-time C code as well. The ad

  • copilot-discussion Contains a tutorial, todos, and other items regarding the Copilot system.

Sources for each package are available on Github as well. Just go to [Github](github.com) and search for the package of interest. Feel free to fork!

Comments, bug reports, and patches are always welcome. Send them to leepike @ gmail.com


Please see the files under the Examples directory for a number of examples showing the syntax, use of libraries, and use of the interpreter and back-ends. The examples is the best way to start.


  • From Hackage:

The Copilot library is cabalized. Assuming you have cabal and the GHC compiler installed (the Haskell Platform is the easiest way to obtain these), it should merely be a matter of running

       cabal install copilot

with an Internet connection. Please see the INSTALL file for installation details.

  • From GitHub:

       git clone https://github.com/leepike/Copilot.git
       git submodule update --init
       make test

Once the installation is done, you can run the executable XXX which will execute the regression test suite for sbv on your machine.

Note there is a TravisCI build (linked to at the top of this README) if you have trouble building/installing.


copilot-cbmc depends on the C model-checker, CBMC. CBMC is a bounded model-checker for C code. We use CBMC to prove that two back-ends generating C generate semantically equivalent C, to help detect bugs in C back-ends.

Copyright, License

Copilot is distributed with the BSD3 license. The license file contains the BSD3 verbiage.


Copilot was developed, in part, with support from NASA's Aviation Safety Program, Contract #NNL08AD13T. Copilot was developed jointly by Galois, Inc. and the National Institute of Aerospace.

The following people have contributed to Copilot: Lee Pike, Nis Wegmann, Sebastian Niller, Robin Morisset, Alwyn Goodloe, and Levent Erkok.

*Note that all licence references and agreements mentioned in the copilot README section above are relevant to that project's source code only.