The Spec# programming system is a new attempt at a more cost effective way to develop and maintain high-quality software. Spec# is pronounced “Spec sharp” and can be written (and searched for) as the “specsharp” or “Spec# programming system”. The Spec# system consists of:
- The Spec# programming language. Spec# is an extension of the object-oriented language C#. It extends the type system to include non-null types and checked exceptions. It provides method contracts in the form of pre- and postconditions as well as object invariants.
- The Spec# compiler. Integrated into the Microsoft Visual Studio development environment for the .NET platform, the compiler statically enforces non-null types, emits run-time checks for method contracts and invariants, and records the contracts as metadata for consumption by downstream tools.
- The Spec# static program verifier. This component (codenamed Boogie) generates logical verification conditions from a Spec# program. Internally, it uses an automatic theorem prover that analyzes the verification conditions to prove the correctness of the program or find errors in it.
A unique feature of the Spec# programming system is its guarantee of maintaining invariants in object-oriented programs in the presence of callbacks, threads, and inter-object relationships.
The Spec# programming system is being developed as a research project at Microsoft Research in Redmond, primarily by the Programming Languages and Methods group.
Download and Discussion Forum
Spec# is available from the Spec# codeplex site in binary form as well as source form.
The Spec# codeplex site also has a discussion forum, which is the best place to ask questions about Spec#.
We provide some benchmarks that can be used to compare the power and performance of other program verifiers and theorem provers. These are generated from the Boogie test suite, and consist of BoogiePL programs (the majority of which were produced by Boogie from Spec# programs in the Boogie test suite) and the verification conditions that Boogie produced from these BoogiePL programs in the format of the Simplify theorem prover.