org.sosy_lab.cpachecker.util.predicates.mathsat5.Mathsat5AbstractProver.java Source code

Introduction

Here is the source code for org.sosy_lab.cpachecker.util.predicates.mathsat5.Mathsat5AbstractProver.java

Source

/*
 *  CPAchecker is a tool for configurable software verification.
 *  This file is part of CPAchecker.
 *
 *  Copyright (C) 2007-2014  Dirk Beyer
 *  All rights reserved.
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *
 *
 *  CPAchecker web page:
 *    http://cpachecker.sosy-lab.org
 */
package org.sosy_lab.cpachecker.util.predicates.mathsat5;

import static org.sosy_lab.cpachecker.util.predicates.mathsat5.Mathsat5NativeApi.*;

import org.sosy_lab.cpachecker.core.counterexample.Model;
import org.sosy_lab.cpachecker.exceptions.SolverException;

import com.google.common.base.Preconditions;
import com.google.common.base.Strings;

/**
 * Common base class for {@link Mathsat5TheoremProver}
 * and {@link Mathsat5InterpolatingProver}.
 */
abstract class Mathsat5AbstractProver {

    protected final Mathsat5FormulaManager mgr;
    protected long curEnv;
    private final long curConfig;

    private final long terminationTest;

    protected Mathsat5AbstractProver(Mathsat5FormulaManager pMgr, long pConfig, boolean pShared,
            boolean pGhostFilter) {
        mgr = pMgr;
        curConfig = pConfig;
        curEnv = mgr.createEnvironment(pConfig, pShared, pGhostFilter);
        terminationTest = mgr.addTerminationTest(curEnv);
    }

    public boolean isUnsat() throws InterruptedException, SolverException {
        Preconditions.checkState(curEnv != 0);
        try {
            return !msat_check_sat(curEnv);
        } catch (IllegalStateException e) {
            String msg = Strings.nullToEmpty(e.getMessage());
            if (msg.contains("too many iterations")
                    || msg.contains("impossible to build a suitable congruence graph!")
                    || msg.contains("can't produce proofs")) {
                // This is not a bug in CPAchecker, but a problem of MathSAT which happens during interpolation
                throw new SolverException(e.getMessage(), e);
            }
            throw e;
        }
    }

    public Model getModel() throws SolverException {
        Preconditions.checkState(curEnv != 0);
        return Mathsat5Model.createMathsatModel(curEnv, mgr);
    }

    public void pop() {
        Preconditions.checkState(curEnv != 0);
        msat_pop_backtrack_point(curEnv);
    }

    public void close() {
        Preconditions.checkState(curEnv != 0);
        msat_destroy_env(curEnv);
        curEnv = 0;
        msat_free_termination_test(terminationTest);
        msat_destroy_config(curConfig);
    }
}