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1 Install & Run Dafny 15-414 Installing Dafny 1 Instructor: Matt Fredrikson TA: Ryan Wagner 1 Install & Run Dafny You will need to use the Dafny verifier and compiler to complete this assignment, which means that you will not be able to use Dafny's online interface. For this, you have two options: 1) use the virtual machine image provided by the course staff, or 2) install Dafny on your machine. Installing on Windows. Windows is the easiest platform to use with Dafny. Note that you can always use a Windows instance through Virtual Andrew, or by installing a virtual machine and using the Dreamspark account the university has provided you to download Windows. For more information on Virtual Andrew, visit: http://www.cmu.edu/computing/tes/computer-labs/software/virtualandrew/index.html For more information on Dreamspark, visit: https://www.cmu.edu/computing/software/all/dreamspark 1. Download the binary release archive from https://github.com/Microsoft/dafny/releases. Be sure to select the right file; it should be named Dafny.1.9.7.for.Windows.zip. 2. Right-click on the archive, select \Properties", and check the \Unblock" box at the bottom of the dialog. Click OK. 3. Open the archive file, and move its contents (which should be a folder named dafny) to a convenient location on your filesystem. 4. Open a command prompt, navigate to the dafny directory, and execute Dafny.exe. Installing on Linux or MacOS. Running Dafny on Linux or MacOS is possible, but requires installing the mono framework first if you do not already have it. 1. Determine whether you have Mono installed. To do this, open a prompt, and type mono -V. 2. If you don't have Mono installed, follow the instructions at http://www.mono-project.com/ docs/getting-started/install/. 3. Download the binary release archive from https://github.com/Microsoft/dafny/releases. Be sure to select the right file; it should be named Dafny.1.9.7.for.Mac.OSX.zip if you are using a Mac, or a similar filename for the Linux distribution that you use. 4. Unpack the archive file, and move its contents (which should be a folder named dafny) to a convenient location on your filesystem. 5. Add an alias for the command: alias dafny="mono /path/to/dafny/Dafny.exe". This will simplify running Dafny from the prompt. 6. Open a prompt, navigate to the dafny directory, and execute mono Dafny.exe. 1 15-414 Installing Dafny 2 All Platforms (after install). After running Dafny.exe, you should see the following text: *** Error: No input files were specified. Now create a file named test.dfy, and add the following code: 1 method Abs(x: int) returns (x': int) 2 ensures x' >= 0 3 ensures (x < 0 && x' == -1*x) || (x' ==x) 4 { 5 x' := x; 6 if(x' < 0) { x' := x' * -1; } 7 } and run: Dafny.exe test.dfy Note that if you are on Mac or Linux, you will need to prefix this command with mono. Make sure that test.dll appears in your working directory, and that you see the following output: Dafny program verifier version 1.9.7.30401, Copyright (c) 2003-2016, Microsoft . Dafny program verifier finished with 2 verified, 0 errors Compiled assembly into test.dll If you do not see this, contact the course staff as soon as possible. Optional: Syntax Highlighting. As an additional step to make development in Dafny more palatable, consider installing syntax highlighting for your preferred editor. There is currently support for the following editors: Emacs: To install support for Emacs, consult https://github.com/boogie-org/boogie-friends. Vim: To install support for Vim, see https://github.com/mlr-msft/vim-loves-dafny. Sublime Text 2: To install support for Sublime, see https://github.com/erggo/sublime-dafny. Visual Studio (Windows only): The Dafny extension for Visual Studio supports syntax high- lighting and incremental verification. Obtain Visual Studio 2012 (note: I have not tested with newer versions) from Dreamspark (see above for the link), install it, and when finished, run DafnyLanguageService.vsix from the Dafny binary distribution file. Dafny mode will become active when you open a file with extension .dfy in Visual Studio. 2.
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