The z3 package

[Tags:bsd3, library]

Bindings for the (now open source!) Z3 4.x Theorem Prover (https://github.com/Z3Prover/z3).

Examples: https://bitbucket.org/iago/z3-haskell/src/tip/examples

Changelog: https://bitbucket.org/iago/z3-haskell/src/tip/CHANGES.md

Installation:

(Hackage reports a build failure because Z3's library is missing.)


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Properties

Versions 0.1.1, 0.2.0, 0.3.0, 0.3.1, 0.3.2, 4.0.0, 4.1.0
Change log CHANGES.md
Dependencies base (>=4.5 && <5), containers, mtl (>2.1) [details]
License BSD3
Copyright 2012-2015, Iago Abal, David Castro
Author Iago Abal <mail@iagoabal.eu>, David Castro <david.castro.dcp@gmail.com>
Maintainer Iago Abal <mail@iagoabal.eu>
Stability Unknown
Category Math, SMT, Theorem Provers, Formal Methods, Bit vectors
Home page http://bitbucket.org/iago/z3-haskell
Source repository head: hg clone https://bitbucket.org/iago/z3-haskell
Uploaded Sat Jul 18 21:30:04 UTC 2015 by IagoAbal
Distributions NixOS:4.1.0
Downloads 1452 total (25 in the last 30 days)
Votes
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Status Docs uploaded by user
Build status unknown [no reports yet]

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Downloads

Maintainer's Corner

For package maintainers and hackage trustees

Readme for z3

Readme for z3-4.1.0

Haskell bindings for Microsoft's Z3 (unofficial)

These are Haskell bindings for the Z3 theorem prover. We don't provide any high-level interface (e.g. in the form of a Haskell eDSL) here, these bindings are targeted to those who want to build verification tools on top of Z3 in Haskell.

Changelog here.

Examples here.

Do you want to contribute?

Installation

Preferably use the z3 package.

  • Install a Z3 4.x release. (Support for Z3 3.x is provided by the 0.3.2 version of these bindings.)

  • Just type cabal install z3 if you used the standard locations for dynamic libraries (/usr/lib) and header files (/usr/include).

    • Otherwise use the --extra-lib-dirs and --extra-include-dirs Cabal flags when installing.

Example

Most people uses the Z3.Monad interface. Here is an example script that solves the 4-queen puzzle:

import Control.Applicative
import Control.Monad ( join )
import Data.Maybe
import qualified Data.Traversable as T

import Z3.Monad

script :: Z3 (Maybe [Integer])
script = do
  q1 <- mkFreshIntVar "q1"
  q2 <- mkFreshIntVar "q2"
  q3 <- mkFreshIntVar "q3"
  q4 <- mkFreshIntVar "q4"
  _1 <- mkInteger 1
  _4 <- mkInteger 4
  -- the ith-queen is in the ith-row.
  -- qi is the column of the ith-queen
  assert =<< mkAnd =<< T.sequence
    [ mkLe _1 q1, mkLe q1 _4  -- 1 <= q1 <= 4
    , mkLe _1 q2, mkLe q2 _4
    , mkLe _1 q3, mkLe q3 _4
    , mkLe _1 q4, mkLe q4 _4
    ]
  -- different columns
  assert =<< mkDistinct [q1,q2,q3,q4]
  -- avoid diagonal attacks
  assert =<< mkNot =<< mkOr =<< T.sequence
    [ diagonal 1 q1 q2  -- diagonal line of attack between q1 and q2
    , diagonal 2 q1 q3
    , diagonal 3 q1 q4
    , diagonal 1 q2 q3
    , diagonal 2 q2 q4
    , diagonal 1 q3 q4
    ]
  -- check and get solution
  fmap snd $ withModel $ \m ->
    catMaybes <$> mapM (evalInt m) [q1,q2,q3,q4]
  where mkAbs x = do
          _0 <- mkInteger 0
          join $ mkIte <$> mkLe _0 x <*> pure x <*> mkUnaryMinus x
        diagonal d c c' =
          join $ mkEq <$> (mkAbs =<< mkSub [c',c]) <*> (mkInteger d)

In order to run this SMT script:

main :: IO ()
main = evalZ3With Nothing opts script >>= \mbSol ->
        case mbSol of
             Nothing  -> error "No solution found."
             Just sol -> putStr "Solution: " >> print sol
  where opts = opt "MODEL" True +? opt "MODEL_COMPLETION" True