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Solver Smtlib subproject in the Theta model checking framework
/*
* Copyright 2024 Budapest University of Technology and Economics
*
* 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.
*/
package hu.bme.mit.theta.solver.smtlib.impl.smtinterpol;
import hu.bme.mit.theta.core.decl.ConstDecl;
import hu.bme.mit.theta.core.type.Expr;
import hu.bme.mit.theta.core.type.booltype.BoolExprs;
import hu.bme.mit.theta.core.type.booltype.BoolType;
import hu.bme.mit.theta.solver.*;
import hu.bme.mit.theta.solver.smtlib.dsl.gen.SMTLIBv2Lexer;
import hu.bme.mit.theta.solver.smtlib.dsl.gen.SMTLIBv2Parser;
import hu.bme.mit.theta.solver.smtlib.solver.SmtLibEnumStrategy;
import hu.bme.mit.theta.solver.smtlib.solver.SmtLibItpSolver;
import hu.bme.mit.theta.solver.smtlib.solver.SmtLibSolverException;
import hu.bme.mit.theta.solver.smtlib.solver.binary.SmtLibSolverBinary;
import hu.bme.mit.theta.solver.smtlib.solver.interpolation.SmtLibInterpolant;
import hu.bme.mit.theta.solver.smtlib.solver.interpolation.SmtLibItpPattern;
import hu.bme.mit.theta.solver.smtlib.solver.model.SmtLibModel;
import hu.bme.mit.theta.solver.smtlib.solver.parser.ThrowExceptionErrorListener;
import hu.bme.mit.theta.solver.smtlib.solver.transformer.SmtLibSymbolTable;
import hu.bme.mit.theta.solver.smtlib.solver.transformer.SmtLibTermTransformer;
import hu.bme.mit.theta.solver.smtlib.solver.transformer.SmtLibTransformationManager;
import org.antlr.v4.runtime.CharStreams;
import org.antlr.v4.runtime.CommonTokenStream;
import org.antlr.v4.runtime.ParserRuleContext;
import org.antlr.v4.runtime.misc.Interval;
import java.util.*;
import java.util.stream.Collectors;
import static com.google.common.base.Preconditions.*;
import static hu.bme.mit.theta.core.type.booltype.BoolExprs.False;
public final class SMTInterpolSmtLibItpSolver extends SmtLibItpSolver {
private final Map, String> assertionNames = new IdentityHashMap<>();
private static final String assertionNamePattern = "_smtinterpol_assertion_%d";
private static long assertionCount = 0;
public SMTInterpolSmtLibItpSolver(
final SmtLibSymbolTable symbolTable,
final SmtLibTransformationManager transformationManager,
final SmtLibTermTransformer termTransformer, final SmtLibSolverBinary solverBinary,
final SmtLibEnumStrategy enumStrategy
) {
super(symbolTable, transformationManager, termTransformer, solverBinary, enumStrategy);
}
@Override
public ItpPattern createTreePattern(final ItpMarkerTree root) {
checkNotNull(root);
return SmtLibItpPattern.of(root);
}
@Override
public SMTInterpolSmtLibItpMarker createMarker() {
final var marker = new SMTInterpolSmtLibItpMarker();
markers.add(marker);
return marker;
}
@Override
protected void add(final SMTInterpolSmtLibItpMarker marker, final Expr assertion,
final Set> consts, final String term) {
consts.stream().map(symbolTable::getDeclaration).forEach(this::issueGeneralCommand);
final var name = String.format(assertionNamePattern, assertionCount++);
assertionNames.put(assertion, name);
issueGeneralCommand(String.format("(assert (! %s :named %s))", enumStrategy.wrapAssertionExpression(term, consts.stream().collect(Collectors.toMap(c -> c, symbolTable::getSymbol))), name));
}
@Override
public Interpolant getInterpolant(final ItpPattern pattern) {
checkState(getStatus() == SolverStatus.UNSAT,
"Cannot get interpolant if status is not UNSAT.");
checkArgument(pattern instanceof SmtLibItpPattern);
@SuppressWarnings("unchecked") final var smtInterpolItpPattern = (SmtLibItpPattern) pattern;
final var term = patternToTerm(smtInterpolItpPattern.getRoot());
final List> itpList = new LinkedList<>();
solverBinary.issueCommand(String.format("(get-interpolants %s)", term));
for (final var itp : parseItpResponse(solverBinary.readResponse())) {
itpList.add(termTransformer.toExpr(itp, BoolExprs.Bool(),
new SmtLibModel(Collections.emptyMap())));
}
itpList.add(False());
final Map> itpMap = new HashMap<>();
buildItpMapFormList(smtInterpolItpPattern.getRoot(), itpList, itpMap);
return new SmtLibInterpolant(itpMap);
}
private String patternToTerm(final ItpMarkerTree markerTree) {
String term;
final var marker = markerTree.getMarker();
final var terms = marker.getTerms();
if (terms.size() == 1) {
term = assertionNames.get(terms.iterator().next().get1());
} else {
term = String.format("(and %s)", terms.stream().map(t -> assertionNames.get(t.get1()))
.collect(Collectors.joining(" ")));
}
final var children = markerTree.getChildren();
for (var i = children.size() - 1; i >= 0; i--) {
if (i == 0) {
term = String.format("%s %s", patternToTerm(children.get(i)), term);
} else {
term = String.format("(%s) %s", patternToTerm(children.get(i)), term);
}
}
return term;
}
private void buildItpMapFormList(final ItpMarkerTree pattern,
final List> itpList, final Map> itpMap) {
for (final ItpMarkerTree child : pattern.getChildren()) {
buildItpMapFormList(child, itpList, itpMap);
}
final ItpMarker marker = pattern.getMarker();
final Expr itpExpr = itpList.get(0);
itpMap.put(marker, itpExpr);
itpList.remove(0);
}
@Override
protected void init() {
issueGeneralCommand("(set-option :print-success true)");
issueGeneralCommand("(set-option :produce-models true)");
issueGeneralCommand("(set-option :produce-interpolants true)");
issueGeneralCommand("(set-logic ALL)");
}
private List parseItpResponse(final String response) {
final var lexer = new SMTLIBv2Lexer(CharStreams.fromString(response));
final var parser = new SMTLIBv2Parser(new CommonTokenStream(lexer));
try {
final var interpolants = new ArrayList();
lexer.removeErrorListeners();
lexer.addErrorListener(new ThrowExceptionErrorListener());
parser.removeErrorListeners();
parser.addErrorListener(new ThrowExceptionErrorListener());
for (final var term : parser.get_interpolants_response_smtinterpol().term()) {
interpolants.add(extractString(term));
}
return interpolants;
} catch (Exception e) {
try {
throw new SmtLibSolverException(
parser.response().general_response_error().reason.getText());
} catch (Exception ex) {
throw new SmtLibSolverException("Could not parse solver output: " + response, e);
}
}
}
private static String extractString(final ParserRuleContext ctx) {
return ctx.start.getInputStream()
.getText(new Interval(ctx.start.getStartIndex(), ctx.stop.getStopIndex()));
}
}