MainInvariantsInterpolation.scala 4.89 KB
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package de.tum.niwo
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import com.microsoft.z3.Status
import com.typesafe.scalalogging.LazyLogging
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import de.tum.niwo.Utils._
import de.tum.niwo.blocks.{SimpleWFBlock, NISpec}
import de.tum.niwo.foltl.FOLTL._
import de.tum.niwo.foltl.FOTransformers
import de.tum.niwo.synth.Model
import de.tum.niwo.toz3._
import de.tum.niwo.foltl.Properties
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// Labelled Edge to Block
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import de.tum.niwo.graphs.WFGraphEncoding.EdgeImplicits._
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object MainInvariantsInterpolation extends App with LazyLogging {

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  def generate(name: String, spec: NISpec, tar:Int) {
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    logger.info(s"Encoding Spec:\n$spec")

    def invariant =
      InvariantGenerator.invariantNoninterSingleBS _
    // InvariantGenerator.invariantNoninterStubbornBS _
    // InvariantChecker.invariantNoninterStubborn _
    // InvariantChecker.invariantAllEqual _

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    val props = InvProperties(stubborn = false, eliminateA = true)
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    val inv = invariant(spec)
    val (res, graph, labels, t) = InvariantChecker.checkInvariantFPHeadLabel(spec, inv, props)

    logger.info(s"Invariant was ${inv}")
    logger.info(s"Invariant was ${if (res) "" else "not "}proven (took $t ms)\n")


    logger.info(s"Graph: $graph")
    val src = 0

    val headlabel = labels(graph.get(src))

    // Invariant not valid
    if (!res) {
      // Try to break headlabel invariant
      val (status, solver) = Z3QFree.checkUniversal(headlabel)

      if (status == Status.SATISFIABLE) {
        // Broken, found model
//        logger.info(s"Model:\n${Z3.printModel(solver.getModel())}")
        logger.info(s"State Invariant: ${headlabel}")
        val z3model = Z3QFree.modelFacts(solver.getModel())

        // make facts
        // filter only workflow rels

//        val relfacts = model

        logger.info(s"Z3model:  $z3model")

        val facts = for ((f, b) <- z3model) yield {
          if (b == True) {
            f
          } else {
            Neg(f)
          }
        }
        logger.info(s"Model Facts: ${facts}")

        val vars = z3model.flatMap { case (f:Fun,b:Formula) => f.freeVars }.distinct
        val groupedvars = vars.groupBy { _.typ }

        // These should only contain Choice and Oracle predicates
        val state = Model.emptystate(spec, groupedvars, props)
        val model = Model(groupedvars, And.make(facts), state)

        logger.info(s"Initial Model: ${model.prettyprint()}")

        // get path
        val source = graph.get(0)
        val target = graph.get(tar)
        val path = source.shortestPathTo(target).get // Has to be connected

        logger.info(s"Path from source to target: $path")

        val newmodel = path.edges.foldLeft(model)((m, e) => m.warp(e, spec, props))

        logger.info(s"Warped Model: ${newmodel.prettyprint}")

        val inv = labels(target)
        val neginv = inv.toNegNf.simplify

        logger.info(s"Invariant before: $neginv")

        // Instantiate inv for given universe
        val instinv = FOTransformers.eliminateUniversals(neginv, vars)
        logger.info(s"Invariant instantiated: $instinv")

        // Put steering into instInv
        val z3map = z3model.toMap
        val steeredinv = instinv.everywhere {
          case f:Fun if z3map.contains(f) => z3map(f)
        }
        val steeredInfinv = steeredinv.assumeEmpty(Properties.INFNAME)

        // just for testing
        val tocheck = List("Assign")

        val modelmap = for ((f, vs) <- newmodel.state; v <- vs if !tocheck.contains(f.name)) yield {
          v match {
            case Neg(f) => (f, False)
            case f:Fun => (f, True)
          }
        }

        val modelinv = steeredInfinv.everywhere {
          case f:Fun if modelmap.contains(f) => modelmap(f)
        }

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//        val easyinv = modelinv.simplify
        val easyinv = steeredInfinv.simplify
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        logger.info(s"inv: $easyinv")


        val itp = Z3QFree.interpolate(newmodel.stateFormula(), easyinv)
        logger.info(s"Interpolant is ${itp.get.toNegNf}")

//        logger.info(s"Model for itp is ${Z3.printModel(Z3QFree.checkSatQFree(itp.get).get)}")

        //        val (s, satisfy) = Z3QFree.checkUniversal(Neg(easyinv))
        //        logger.info(s"Model: ${Z3.printModel(satisfy.getModel)}")


      } else {
        logger.error("Invariant not valid, but also not satisfiable.")
      }
    }


  }


  def generateExample(name: String, target: Int) {
    logger.info(s"Generating $name")
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    val spec = Examples.parseExampleWF(name)
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    if (spec.isEmpty) {
      logger.error(s"Not a valid spec: $name")
    }

    spec.foreach(generate(name, _, target))
  }

//  def generateAllExamples() {
//    clear()
//    // Fill results alphabetically
//    for (k <- ExampleWorkflows.examples.keys.toList.sorted) {
//      generateExample(k)
//    }
//  }

//  clear()
  //  generateExample("nonomitting/conference")
  generateExample("tests/conference_linear_small", 1)
//  generateExample("nonomitting/conference_linear", 2)
//  generateExample("tests/loopexampleNoOracle")
  //  generateAllExamples()
}