By Bart Jacobs*, Jan Smans*, and Frank Piessens*, with contributions by Pieter Agten*, Cedric Cuypers*, Lieven Desmet*, Niels Mommen*, Jan Tobias Muehlberg*, Willem Penninckx*, Pieter Philippaerts*, Nima Rahimi Foroushaani*, Amin Timany*, Thomas Van Eyck*, Gijs Vanspauwen*, Frédéric Vogels*, and external contributors
* imec-DistriNet research group, Department of Computer Science, KU Leuven - University of Leuven, Belgium
VeriFast is a research prototype of a tool for modular formal verification of correctness properties of single-threaded and multithreaded C, Rust and Java programs annotated with preconditions and postconditions written in separation logic. To express rich specifications, the programmer can define inductive datatypes, primitive recursive pure functions over these datatypes, and abstract separation logic predicates. To verify these rich specifications, the programmer can write lemma functions, i.e., functions that serve only as proofs that their precondition implies their postcondition. The verifier checks that lemma functions terminate and do not have side-effects. Since neither VeriFast itself nor the underlying SMT solver need to do any significant search, verification time is predictable and low.
The VeriFast source code and binaries are released under the MIT license.
Within an hour after each push to the master branch, binary packages become available here.
These "nightly" builds are very stable and are recommended. Still, named releases are available here. (An archive of older named releases is here.)
Simply extract the files from the archive to any location in your filesystem. All files in the archive are in a directory named verifast-COMMIT where COMMIT describes the Git commit. For example, on Linux:
tar xzf ~/Downloads/verifast-nightly.tar.gz
cd verifast-<TAB> # Press Tab to autocomplete
bin/vfide examples/java/termination/Stack.jarsrc # Launch the VeriFast IDE with the specified example
./test.sh # Run the test suite (verifies all examples)
Note (macOS): To avoid GateKeeper issues, before opening the downloaded archive, remove the com.apple.quarantine attribute by running
sudo xattr -d com.apple.quarantine ~/Downloads/verifast-nightly-osx.tar.gz
The VeriFast MacOS binary is an x86 binary. To run it on Apple Silicon, you need to install Rosetta 2 by running
softwareupdate --install-rosetta
Supply chain security: The CI workflow creates GitHub Artifact Attestations for these binaries, so that you can verify that they were generated by a GitHub Actions workflow triggered by a push to this repository. To do so, install the GitHub CLI and run
gh attestation verify verifast-21.04-352-gbeb57a82-macos.tar.gz --repo verifast/verifast
To check for a particular commit SHA, run
[ "$(gh attestation verify verifast-21.04-352-gbeb57a82-macos.tar.gz --repo verifast/verifast --format json --jq '.[0].verificationResult.signature.certificate.sourceRepositoryDigest')" = "beb57a820915409f71dbc2a802985e291e60e12d" ]
We offer the following user interfaces:
bin/vfide in the distribution)bin/verifast in the distribution)We gratefully acknowledge the authors and contributors of the following software packages.
Bits that we ship in our binary packagesWe gratefully acknowledge the following infrastructure providers.
This work is supported in part by the Flemish Research Fund (FWO-Vlaanderen), by the EU FP7 projects SecureChange, STANCE, ADVENT, and VESSEDIA, by Microsoft Research Cambridge as part of the Verified Software Initiative, by the Research Fund KU Leuven, and by the Cybersecurity Research Program Flanders.
To be notified whenever commits are pushed to this repository, join the verifast-commits Google Groups forum.
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