This is ViperServer, an HTTP server that manages verification requests to different tools from the Viper tool stack.

The main two Viper tools (a.k.a verification backends) currently are:

• Carbon, a verification condition generation (VCG) backend for the Viper language.
• Silicon, a symbolic execution verification backend.

The Purpose of ViperServer

1. Viper IDE: integration of Viper into Visual Studio Code (VS Code). Viper IDE provides the best user experience for Viper. More details here: http://viper.ethz.ch/downloads/
2. Facilitate the development of verification IDEs for Viper frontends, such as:
   • Gobra, the Viper-based verifier for the Go language
   • Prusti, the Viper-based verifier for the Rust language
3. Avoid 1-3 second delays caused by JVM startup time. ViperServer offers a robust alternative to, e.g., Nailgun.
4. Develop Viper encodings more efficiently with caching.
5. Interact with Viper tools programmatically using the HTTP API. A reference client implementation (in Python) is available via viper_client.

For more details about using Viper, please visit: http://viper.ethz.ch/downloads/

Installation Instructions

• Clone viperserver (this repository) in your computer.

• Execute git submodule update --init --recursive in the cloned directory to fetch the carbon, silicon, and (transitively) the silver repositories. Note that both carbon and silicon have a silver submodule. Even though silicon's silver repository is actually used for compilation of ViperServer, we assume that both reference the same silver commit.

• Compile by typing: sbt compile

• Other supported SBT commands are: sbt stage (produces fine-grained jar files), sbt assembly (produces a single fat jar file).

Running Tests

• Set the environment variable Z3_EXE to an executable of a recent version of Z3.

• Run the following command: sbt test.

Who do I talk to?

• This repository is maintained by Linard Arquint.