https://github.com/xldenis/rhb-specs

https://github.com/xldenis/rhb-specs

Last synced: 14 days ago
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• Host: GitHub
• URL: https://github.com/xldenis/rhb-specs
• Owner: xldenis
• Created: 2021-11-18T20:40:59.000Z (almost 3 years ago)
• Default Branch: master
• Last Pushed: 2022-04-12T21:06:01.000Z (over 2 years ago)
• Last Synced: 2024-05-22T20:32:38.635Z (6 months ago)
• Language: Rust
• Size: 72.3 KB
• Stars: 5
• Watchers: 4
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

Awesome Lists containing this project

• awesome-rust-formalized-reasoning - RustHornBelt Library & Benchmarks - evaluation libraries and benchmarks for the RustHornBelt PLDI paper. (Projects / Verification)

README

        
# RustHornBelt Library & Benchmarks

This crate contains the evaluation libraries and benchmarks for the RustHornBelt PLDI paper.

The crate includes the following benchmarks:

1. Fibonacci Cell, demonstrates how the RustHornBelt representation of Cells as invariants is expressive enough to express memoization by memoizing a fibonacci calculation.

2. Even Cell, demonstrates a simple invariant cell which always holds an even value.

3. In Place List reversal, reverses a linked list inplace using a memswap like function, proved correct in RustHornBelt.

4. Even Mutex, demonstrates how to use an invariant representation for a mutex by storing and incrementing an even value within one.

5. Knight's Tour, proves the safety of a Knight's Tour calculation, using specifications proved for vectors.

6. All Zero, zeroes the cells of a vector using indexing.

7. Inc Vec, increments the cells of a vector using a mutable iterator, proved correct in RustHornBelt.

Each example is in its own file inside of `src/`

All RustHornBelt specifications are provided in `src/prelude/`.

## Brief overview of Creusot specification syntax.

Creusot specifications are written in a first-order program logic, which includes two novel operators.

The `^` operator (pronounced *final*) accesses the prophecy of a mutable borrow, this corresponds to taking the second projection of the representation of a mutable borrow in RustHornBelt.

The `@` operator (pronounced *model*) accesses the *representation value* of a type, like `⌊_⌋` in RustHornBelt.

To access the *current* value of a mutable borrow, we just use normal dereferencing, as it is just the value being pointed to at any moment by the borrow.

So the resolution of a mutable borrow can be expressed as the equality: `^ x == * x`, stating that the final value of `x` equals the current value of `x`.

## Generating and verifying proofs yourself

1. To verify the benchmarks, first install Creusot:

```

git clone https://github.com/xldenis/creusot

cargo install --path creusot

```

2. Install Why3, following Creusot's installation guide:

```

opam pin add why3 https://gitlab.inria.fr/why3/why3.git#master

```

3. Install Z3 and CVC4.

4. Configure why3:

```

why3 config detect

```

4. Then compile the crate using Creusot:

```

make proofs

```

5. Finally, load the proofs in why3

```

why3 ide -Lpath/to/creusot/prelude proofs.mlcfg

```