Yices2

Low and high-level Rust bindings to the Yices2 SMT solver.

• Yices2
  • Example
    • Linear Real Arithmetic
    • BitVectors
  • Usage
  • Features
  • Notes

Example

Linear Real Arithmetic

use yices2::prelude::*;

fn main() -> Result<(), Error> {
  let config = Config::with_defaults_for_logics([Logic::QF_LRA])?;
  let ctx = Context::with_config(&config)?;
  let x = Uninterpreted::with_name(RealType::new()?.into(), "x")?;
  let y = Uninterpreted::with_name(RealType::new()?.into(), "y")?;
  let t1 = Add::new(x.into(), y.into())?;
  let t2 = ArithmeticGreaterThanAtom::new(t1.into(), ArithmeticConstant::zero()?.into())?;
  let t3 = Or::new([
      ArithmeticLessThanAtom::new(x.into(), ArithmeticConstant::zero()?.into())?.into(),
      ArithmeticLessThanAtom::new(y.into(), ArithmeticConstant::zero()?.into())?.into(),
  ])?;
  ctx.assert([t2.into(), t3.into()])?;
  let status = ctx.check()?;
  assert_eq!(status, Status::STATUS_SAT);
  let xv = ctx.model()?.get_double(&x.into())?;
  let yv = ctx.model()?.get_double(&y.into())?;
  assert_eq!(xv, 2.0);
  assert_eq!(yv, -1.0);

  Ok(())
}

BitVectors

use yices2::prelude::*;

fn main() -> Result<(), Error> {
  let config = Config::with_defaults_for_logics([Logic::QF_BV])?;
  let ctx = Context::with_config(&config)?;
  let bv = BitVectorType::new(32)?;
  let bvc = BitVectorConstant::from_hex_with_name("00000000", "c")?;
  let x = Uninterpreted::with_name(bv.into(), "x")?;
  let y = Uninterpreted::with_name(bv.into(), "y")?;
  let a1 = BitVectorSignedGreaterThanAtom::new(x.into(), bvc.into())?;
  let a2 = BitVectorSignedGreaterThanAtom::new(y.into(), bvc.into())?;
  let a3 = BitVectorSignedLessThanAtom::new(
      BitVectorAdd::new(x.into(), y.into())?.into(),
      x.into(),
  )?;
  ctx.assert([a1.into(), a2.into(), a3.into()])?;

  assert_eq!(ctx.check()?, Status::STATUS_SAT);

  Ok(())
}

Usage

You can add this crate to your project by running:

cargo add yices2

Or by adding this line to your Cargo.toml:

yices2 = { version = "2.6.4" }

Features

By default, yices2 enables the ctor feature, which calls yices_init at program initialization and yices_exit at program exit. If you'd like to disable this behavior, you can use the default-features = false flag in your Cargo.toml.

yices2 = { version = "2.6.4", default-features = false }

Notes

This library is not thread safe, because the underlying Yices2 library is not thread safe. Do not use this library in multithreaded code. To use in multi-threaded code, create a separate process and submit requests to the solver running in that process or disable the ctor feature and manage state yourself.