org.sosy_lab.cpachecker.util.predicates.smt.ProverEnvironmentView.java Source code

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Here is the source code for org.sosy_lab.cpachecker.util.predicates.smt.ProverEnvironmentView.java

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/*
 * CPAchecker is a tool for configurable software verification.
 *  This file is part of CPAchecker.
 *
 *  Copyright (C) 2007-2016  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.smt;

import static com.google.common.collect.FluentIterable.from;

import com.google.common.collect.ImmutableList;

import org.sosy_lab.java_smt.api.SolverException;
import org.sosy_lab.java_smt.api.BooleanFormula;
import org.sosy_lab.java_smt.api.Model;
import org.sosy_lab.java_smt.api.Model.ValueAssignment;
import org.sosy_lab.java_smt.api.ProverEnvironment;

import java.util.Collection;
import java.util.List;
import java.util.Optional;

import javax.annotation.Nullable;

/**
 * Wrapping handler for ProverEnvironment.
 */
class ProverEnvironmentView implements ProverEnvironment {
    private final ProverEnvironment delegate;
    private final FormulaWrappingHandler wrappingHandler;

    public ProverEnvironmentView(ProverEnvironment pDelegate, FormulaWrappingHandler pWrappingHandler) {
        delegate = pDelegate;
        wrappingHandler = pWrappingHandler;
    }

    @Override
    public List<BooleanFormula> getUnsatCore() {
        return delegate.getUnsatCore();
    }

    @Override
    public <T> T allSat(AllSatCallback<T> callback, List<BooleanFormula> important)
            throws InterruptedException, SolverException {
        return delegate.allSat(callback, important);
    }

    @Override
    public boolean isUnsatWithAssumptions(Collection<BooleanFormula> assumptions)
            throws SolverException, InterruptedException {
        return delegate.isUnsatWithAssumptions(assumptions);
    }

    @Override
    public Optional<List<BooleanFormula>> unsatCoreOverAssumptions(Collection<BooleanFormula> assumptions)
            throws SolverException, InterruptedException {
        return delegate.unsatCoreOverAssumptions(assumptions);
    }

    @Nullable
    @Override
    public Void push(BooleanFormula f) {
        return delegate.push(f);
    }

    @Override
    public void pop() {
        delegate.pop();
    }

    @Override
    public Void addConstraint(BooleanFormula constraint) {
        return delegate.addConstraint(constraint);
    }

    @Override
    public void push() {
        delegate.push();
    }

    @Override
    public boolean isUnsat() throws SolverException, InterruptedException {
        return delegate.isUnsat();
    }

    @Override
    public Model getModel() throws SolverException {
        return new ModelView(delegate.getModel(), wrappingHandler);
    }

    @Override
    public ImmutableList<ValueAssignment> getModelAssignments() throws SolverException {
        return fixModelAssignments(delegate.getModelAssignments());
    }

    /**
     * Z3 adds irrelevant terms to the model if quantifiers and UFs are used, remove them.
     */
    static ImmutableList<ValueAssignment> fixModelAssignments(ImmutableList<ValueAssignment> m) {
        if (m.stream().noneMatch(valueAssignment -> valueAssignment.getName().contains("!"))) {
            return m; // fast path for common case
        }

        return from(m).filter(ModelView.FILTER_MODEL_TERM).toList();
    }

    @Override
    public void close() {
        delegate.close();
    }
}