rosette

This repository includes the source code and default solver binaries for the Rosette solver-aided host language, as well as several example solver-aided DSLs and demos.

Installing Rosette

• Download and install Racket 6.1 from http://racket-lang.org

• Make sure that the default Java installation on your system is a 64-bit server VM, version 1.7x:

  $ java -version
java version "1.7.0_25"
Java(TM) SE Runtime Environment (build 1.7.0_25-b15)
Java HotSpot(TM) 64-Bit Server VM (build 23.25-b01, mixed mode)

• Clone the rosette repository:

  $ git clone git@github.com:emina/rosette.git

• Rosette ships with the Kodkod solver binaries, but it also supports Z3. To use Z3, download (or build) the binaries for your system and put them in the rosette/bin directory.

  $ ls rosette/bin
kodkod z3

• Use Racket's raco tool to install Rosette as one of your Racket collections:

  $ cd rosette
$ raco link rosette

Executing Rosette programs

• Open the target program in DrRacket (e.g., rosette/sdsl/fsm/demo.rkt) and hit run!

• The first time you run any program in Rosette, DrRacket will have to compile the Rosette implementation, which may take a few seconds. Subsequent compilations should be fast.

• DrRacket is the preferred way to execute Rosette programs. If you need to use the command line, make sure to first compile the program (and the Rosette implementation):

  $ raco make <your program>
$ racket -r <your program>

Available languages

• Rosette ships with two languages: #lang s-exp rosette/safe and #lang s-exp rosette.

• The rosette/safe language includes only constructs that are safe to use with symbolic values. This (for now) excludes some nice Racket features, such as iteration constructs. The semantics of these constructs can be expressed in the core language, however, so no expressiveness is lost (just convenience). It is recommended for new users of Rosette to start with the rosette/safe language. To see the list of syntactic forms and procedures provided by rosette/safe, type the following into the Rosette REPL:

  > (rosette)
'(define assert let let* ...)

• The rosette language includes all of Racket. This places the burden on the programmer to decide whether a given Racket construct (which is not overriden by Rosette) is safe to use in a given context. Rosette provides no guarantees or checks for programs that use unsafe constructs. In the best case, such a program will fail with an exception if a symbolic value flows to a construct that does not support it. In the worst case, it will continue executing with incorrect semantics.

• For more on Rosette, see:

  • Emina Torlak and Rastislav Bodik. A lightweight symbolic virtual machine for solver-aided host languages. In PLDI'14.

  • Emina Torlak and Rastislav Bodik. Growing solver-aided languages with rosette. In Onward!'13.