// checks whether a type is closed enumerable and is reasonably small enough (<1000)
// such that all of its domain elements can be enumerated
bool TermEnumeration::mayComplete(TypeNode tn)
{
std::unordered_map<TypeNode, bool, TypeNodeHashFunction>::iterator it =
d_may_complete.find(tn);
if (it == d_may_complete.end())
{
bool mc = false;
if (isClosedEnumerableType(tn) && tn.getCardinality().isFinite()
&& !tn.getCardinality().isLargeFinite())
{
Node card = NodeManager::currentNM()->mkConst(
Rational(tn.getCardinality().getFiniteCardinality()));
Node oth = NodeManager::currentNM()->mkConst(Rational(1000));
Node eq = NodeManager::currentNM()->mkNode(LEQ, card, oth);
eq = Rewriter::rewrite(eq);
mc = eq.isConst() && eq.getConst<bool>();
}
d_may_complete[tn] = mc;
return mc;
}
else
{
return it->second;
}
}
void ModelEngine::registerQuantifier( Node f ){
if( Trace.isOn("fmf-warn") ){
bool canHandle = true;
for( unsigned i=0; i<f[0].getNumChildren(); i++ ){
TypeNode tn = f[0][i].getType();
if( !tn.isSort() ){
if( !tn.getCardinality().isFinite() ){
if( tn.isInteger() ){
if( !options::fmfBoundInt() ){
canHandle = false;
}
}else{
canHandle = false;
}
}
}
}
if( !canHandle ){
Trace("fmf-warn") << "Warning : Model Engine : may not be able to answer SAT because of formula : " << f << std::endl;
}
}
}
bool RepSetIterator::initialize( RepBoundExt* rext ){
Trace("rsi") << "Initialize rep set iterator..." << std::endl;
for( unsigned v=0; v<d_types.size(); v++ ){
d_index.push_back( 0 );
//store default index order
d_index_order.push_back( v );
d_var_order[v] = v;
//store default domain
//d_domain.push_back( RepDomain() );
d_domain_elements.push_back( std::vector< Node >() );
TypeNode tn = d_types[v];
Trace("rsi") << "Var #" << v << " is type " << tn << "..." << std::endl;
if( tn.isSort() ){
//must ensure uninterpreted type is non-empty.
if( !d_rep_set->hasType( tn ) ){
//FIXME:
// terms in rep_set are now constants which mapped to terms through TheoryModel
// thus, should introduce a constant and a term. for now, just a term.
//Node c = d_qe->getTermDatabase()->getEnumerateTerm( tn, 0 );
Node var = d_qe->getModel()->getSomeDomainElement( tn );
Trace("mkVar") << "RepSetIterator:: Make variable " << var << " : " << tn << std::endl;
d_rep_set->add( tn, var );
}
}
bool inc = true;
//check if it is externally bound
if( rext && rext->setBound( d_owner, v, tn, d_domain_elements[v] ) ){
d_enum_type.push_back( ENUM_DEFAULT );
inc = false;
//builtin: check if it is bound by bounded integer module
}else if( d_owner.getKind()==FORALL && d_qe && d_qe->getBoundedIntegers() ){
if( d_qe->getBoundedIntegers()->isBoundVar( d_owner, d_owner[0][v] ) ){
unsigned bvt = d_qe->getBoundedIntegers()->getBoundVarType( d_owner, d_owner[0][v] );
if( bvt!=quantifiers::BoundedIntegers::BOUND_FINITE ){
d_enum_type.push_back( ENUM_BOUND_INT );
inc = false;
}else{
//will treat in default way
}
}
}
if( !tn.isSort() ){
if( inc ){
if( d_qe->getTermDatabase()->mayComplete( tn ) ){
Trace("rsi") << " do complete, since cardinality is small (" << tn.getCardinality() << ")..." << std::endl;
d_rep_set->complete( tn );
//must have succeeded
Assert( d_rep_set->hasType( tn ) );
}else{
Trace("rsi") << " variable cannot be bounded." << std::endl;
Trace("fmf-incomplete") << "Incomplete because of quantification of type " << tn << std::endl;
d_incomplete = true;
}
}
}
//if we have yet to determine the type of enumeration
if( d_enum_type.size()<=v ){
if( d_rep_set->hasType( tn ) ){
d_enum_type.push_back( ENUM_DEFAULT );
for( unsigned j=0; j<d_rep_set->d_type_reps[tn].size(); j++ ){
//d_domain[v].push_back( j );
d_domain_elements[v].push_back( d_rep_set->d_type_reps[tn][j] );
}
}else{
Assert( d_incomplete );
return false;
}
}
}
//must set a variable index order based on bounded integers
if( d_owner.getKind()==FORALL && d_qe && d_qe->getBoundedIntegers() ){
Trace("bound-int-rsi") << "Calculating variable order..." << std::endl;
std::vector< int > varOrder;
for( unsigned i=0; i<d_qe->getBoundedIntegers()->getNumBoundVars( d_owner ); i++ ){
Node v = d_qe->getBoundedIntegers()->getBoundVar( d_owner, i );
Trace("bound-int-rsi") << " bound var #" << i << " is " << v << std::endl;
varOrder.push_back( d_qe->getTermDatabase()->getVariableNum( d_owner, v ) );
}
for( unsigned i=0; i<d_owner[0].getNumChildren(); i++) {
if( !d_qe->getBoundedIntegers()->isBoundVar(d_owner, d_owner[0][i])) {
varOrder.push_back(i);
}
}
Trace("bound-int-rsi") << "Variable order : ";
for( unsigned i=0; i<varOrder.size(); i++) {
Trace("bound-int-rsi") << varOrder[i] << " ";
}
Trace("bound-int-rsi") << std::endl;
std::vector< int > indexOrder;
indexOrder.resize(varOrder.size());
for( unsigned i=0; i<varOrder.size(); i++){
indexOrder[varOrder[i]] = i;
}
Trace("bound-int-rsi") << "Will use index order : ";
for( unsigned i=0; i<indexOrder.size(); i++) {
Trace("bound-int-rsi") << indexOrder[i] << " ";
}
Trace("bound-int-rsi") << std::endl;
setIndexOrder( indexOrder );
}
//now reset the indices
do_reset_increment( -1, true );
return true;
}
void TheoryEngineModelBuilder::buildModel(Model* m, bool fullModel)
{
TheoryModel* tm = (TheoryModel*)m;
// buildModel with fullModel = true should only be called once in any context
Assert(!tm->d_modelBuilt);
tm->d_modelBuilt = fullModel;
// Reset model
tm->reset();
// Collect model info from the theories
Trace("model-builder") << "TheoryEngineModelBuilder: Collect model info..." << std::endl;
d_te->collectModelInfo(tm, fullModel);
// Loop through all terms and make sure that assignable sub-terms are in the equality engine
eq::EqClassesIterator eqcs_i = eq::EqClassesIterator( &tm->d_equalityEngine );
{
NodeSet cache;
for ( ; !eqcs_i.isFinished(); ++eqcs_i) {
eq::EqClassIterator eqc_i = eq::EqClassIterator((*eqcs_i), &tm->d_equalityEngine);
for ( ; !eqc_i.isFinished(); ++eqc_i) {
checkTerms(*eqc_i, tm, cache);
}
}
}
Trace("model-builder") << "Collect representatives..." << std::endl;
// Process all terms in the equality engine, store representatives for each EC
std::map< Node, Node > assertedReps, constantReps;
TypeSet typeConstSet, typeRepSet, typeNoRepSet;
std::set< TypeNode > allTypes;
eqcs_i = eq::EqClassesIterator(&tm->d_equalityEngine);
for ( ; !eqcs_i.isFinished(); ++eqcs_i) {
// eqc is the equivalence class representative
Node eqc = (*eqcs_i);
Trace("model-builder") << "Processing EC: " << eqc << endl;
Assert(tm->d_equalityEngine.getRepresentative(eqc) == eqc);
TypeNode eqct = eqc.getType();
Assert(assertedReps.find(eqc) == assertedReps.end());
Assert(constantReps.find(eqc) == constantReps.end());
// Loop through terms in this EC
Node rep, const_rep;
eq::EqClassIterator eqc_i = eq::EqClassIterator(eqc, &tm->d_equalityEngine);
for ( ; !eqc_i.isFinished(); ++eqc_i) {
Node n = *eqc_i;
Trace("model-builder") << " Processing Term: " << n << endl;
// Record as rep if this node was specified as a representative
if (tm->d_reps.find(n) != tm->d_reps.end()){
Assert(rep.isNull());
rep = tm->d_reps[n];
Assert(!rep.isNull() );
Trace("model-builder") << " Rep( " << eqc << " ) = " << rep << std::endl;
}
// Record as const_rep if this node is constant
if (n.isConst()) {
Assert(const_rep.isNull());
const_rep = n;
Trace("model-builder") << " ConstRep( " << eqc << " ) = " << const_rep << std::endl;
}
//model-specific processing of the term
tm->addTerm(n);
}
// Assign representative for this EC
if (!const_rep.isNull()) {
// Theories should not specify a rep if there is already a constant in the EC
Assert(rep.isNull() || rep == const_rep);
constantReps[eqc] = const_rep;
typeConstSet.add(eqct.getBaseType(), const_rep);
}
else if (!rep.isNull()) {
assertedReps[eqc] = rep;
typeRepSet.add(eqct.getBaseType(), eqc);
allTypes.insert(eqct);
}
else {
typeNoRepSet.add(eqct, eqc);
allTypes.insert(eqct);
}
}
// Need to ensure that each EC has a constant representative.
Trace("model-builder") << "Processing EC's..." << std::endl;
TypeSet::iterator it;
set<TypeNode>::iterator type_it;
set<Node>::iterator i, i2;
bool changed, unassignedAssignable, assignOne = false;
set<TypeNode> evaluableSet;
// Double-fixed-point loop
// Outer loop handles a special corner case (see code at end of loop for details)
for (;;) {
// Inner fixed-point loop: we are trying to learn constant values for every EC. Each time through this loop, we process all of the
// types by type and may learn some new EC values. EC's in one type may depend on EC's in another type, so we need a fixed-point loop
// to ensure that we learn as many EC values as possible
do {
changed = false;
unassignedAssignable = false;
evaluableSet.clear();
// Iterate over all types we've seen
for (type_it = allTypes.begin(); type_it != allTypes.end(); ++type_it) {
TypeNode t = *type_it;
TypeNode tb = t.getBaseType();
set<Node>* noRepSet = typeNoRepSet.getSet(t);
// 1. Try to evaluate the EC's in this type
if (noRepSet != NULL && !noRepSet->empty()) {
Trace("model-builder") << " Eval phase, working on type: " << t << endl;
bool assignable, evaluable, evaluated;
d_normalizedCache.clear();
for (i = noRepSet->begin(); i != noRepSet->end(); ) {
i2 = i;
++i;
assignable = false;
evaluable = false;
evaluated = false;
eq::EqClassIterator eqc_i = eq::EqClassIterator(*i2, &tm->d_equalityEngine);
for ( ; !eqc_i.isFinished(); ++eqc_i) {
Node n = *eqc_i;
if (isAssignable(n)) {
assignable = true;
}
else {
evaluable = true;
Node normalized = normalize(tm, n, constantReps, true);
if (normalized.isConst()) {
typeConstSet.add(tb, normalized);
constantReps[*i2] = normalized;
Trace("model-builder") << " Eval: Setting constant rep of " << (*i2) << " to " << normalized << endl;
changed = true;
evaluated = true;
noRepSet->erase(i2);
break;
}
}
}
if (!evaluated) {
if (evaluable) {
evaluableSet.insert(tb);
}
if (assignable) {
unassignedAssignable = true;
}
}
}
}
// 2. Normalize any non-const representative terms for this type
set<Node>* repSet = typeRepSet.getSet(t);
if (repSet != NULL && !repSet->empty()) {
Trace("model-builder") << " Normalization phase, working on type: " << t << endl;
d_normalizedCache.clear();
for (i = repSet->begin(); i != repSet->end(); ) {
Assert(assertedReps.find(*i) != assertedReps.end());
Node rep = assertedReps[*i];
Node normalized = normalize(tm, rep, constantReps, false);
Trace("model-builder") << " Normalizing rep (" << rep << "), normalized to (" << normalized << ")" << endl;
if (normalized.isConst()) {
changed = true;
typeConstSet.add(t.getBaseType(), normalized);
constantReps[*i] = normalized;
assertedReps.erase(*i);
i2 = i;
++i;
repSet->erase(i2);
}
else {
if (normalized != rep) {
assertedReps[*i] = normalized;
changed = true;
}
++i;
}
}
}
}
} while (changed);
if (!fullModel || !unassignedAssignable) {
break;
}
// 3. Assign unassigned assignable EC's using type enumeration - assign a value *different* from all other EC's if the type is infinite
// Assign first value from type enumerator otherwise - for finite types, we rely on polite framework to ensure that EC's that have to be
// different are different.
// Only make assignments on a type if:
// 1. fullModel is true
// 2. there are no terms that share the same base type with un-normalized representatives
// 3. there are no terms that share teh same base type that are unevaluated evaluable terms
// Alternatively, if 2 or 3 don't hold but we are in a special deadlock-breaking mode where assignOne is true, go ahead and make one assignment
changed = false;
for (it = typeNoRepSet.begin(); it != typeNoRepSet.end(); ++it) {
set<Node>& noRepSet = TypeSet::getSet(it);
if (noRepSet.empty()) {
continue;
}
TypeNode t = TypeSet::getType(it);
TypeNode tb = t.getBaseType();
if (!assignOne) {
set<Node>* repSet = typeRepSet.getSet(tb);
if (repSet != NULL && !repSet->empty()) {
continue;
}
if (evaluableSet.find(tb) != evaluableSet.end()) {
continue;
}
}
Trace("model-builder") << " Assign phase, working on type: " << t << endl;
bool assignable, evaluable CVC4_UNUSED;
for (i = noRepSet.begin(); i != noRepSet.end(); ) {
i2 = i;
++i;
eq::EqClassIterator eqc_i = eq::EqClassIterator(*i2, &tm->d_equalityEngine);
assignable = false;
evaluable = false;
for ( ; !eqc_i.isFinished(); ++eqc_i) {
Node n = *eqc_i;
if (isAssignable(n)) {
assignable = true;
}
else {
evaluable = true;
}
}
if (assignable) {
Assert(!evaluable || assignOne);
Assert(!t.isBoolean() || (*i2).getKind() == kind::APPLY_UF);
Node n;
if (t.getCardinality().isInfinite()) {
n = typeConstSet.nextTypeEnum(t, true);
}
else {
TypeEnumerator te(t);
n = *te;
}
Assert(!n.isNull());
constantReps[*i2] = n;
Trace("model-builder") << " Assign: Setting constant rep of " << (*i2) << " to " << n << endl;
changed = true;
noRepSet.erase(i2);
if (assignOne) {
assignOne = false;
break;
}
}
}
}
// Corner case - I'm not sure this can even happen - but it's theoretically possible to have a cyclical dependency
// in EC assignment/evaluation, e.g. EC1 = {a, b + 1}; EC2 = {b, a - 1}. In this case, neither one will get assigned because we are waiting
// to be able to evaluate. But we will never be able to evaluate because the variables that need to be assigned are in
// these same EC's. In this case, repeat the whole fixed-point computation with the difference that the first EC
// that has both assignable and evaluable expressions will get assigned.
if (!changed) {
Assert(!assignOne); // check for infinite loop!
assignOne = true;
}
}
#ifdef CVC4_ASSERTIONS
if (fullModel) {
// Assert that all representatives have been converted to constants
for (it = typeRepSet.begin(); it != typeRepSet.end(); ++it) {
set<Node>& repSet = TypeSet::getSet(it);
if (!repSet.empty()) {
Trace("model-builder") << "***Non-empty repSet, size = " << repSet.size() << ", first = " << *(repSet.begin()) << endl;
Assert(false);
}
}
}
#endif /* CVC4_ASSERTIONS */
Trace("model-builder") << "Copy representatives to model..." << std::endl;
tm->d_reps.clear();
std::map< Node, Node >::iterator itMap;
for (itMap = constantReps.begin(); itMap != constantReps.end(); ++itMap) {
tm->d_reps[itMap->first] = itMap->second;
tm->d_rep_set.add(itMap->second);
}
if (!fullModel) {
// Make sure every EC has a rep
for (itMap = assertedReps.begin(); itMap != assertedReps.end(); ++itMap ) {
tm->d_reps[itMap->first] = itMap->second;
tm->d_rep_set.add(itMap->second);
}
for (it = typeNoRepSet.begin(); it != typeNoRepSet.end(); ++it) {
set<Node>& noRepSet = TypeSet::getSet(it);
set<Node>::iterator i;
for (i = noRepSet.begin(); i != noRepSet.end(); ++i) {
tm->d_reps[*i] = *i;
tm->d_rep_set.add(*i);
}
}
}
//modelBuilder-specific initialization
processBuildModel( tm, fullModel );
#ifdef CVC4_ASSERTIONS
if (fullModel) {
// Check that every term evaluates to its representative in the model
for (eqcs_i = eq::EqClassesIterator(&tm->d_equalityEngine); !eqcs_i.isFinished(); ++eqcs_i) {
// eqc is the equivalence class representative
Node eqc = (*eqcs_i);
Node rep;
itMap = constantReps.find(eqc);
if (itMap == constantReps.end() && eqc.getType().isBoolean()) {
rep = tm->getValue(eqc);
Assert(rep.isConst());
}
else {
Assert(itMap != constantReps.end());
rep = itMap->second;
}
eq::EqClassIterator eqc_i = eq::EqClassIterator(eqc, &tm->d_equalityEngine);
for ( ; !eqc_i.isFinished(); ++eqc_i) {
Node n = *eqc_i;
static int repCheckInstance = 0;
++repCheckInstance;
Debug("check-model::rep-checking")
<< "( " << repCheckInstance <<") "
<< "n: " << n << endl
<< "getValue(n): " << tm->getValue(n) << endl
<< "rep: " << rep << endl;
Assert(tm->getValue(*eqc_i) == rep);
}
}
}
#endif /* CVC4_ASSERTIONS */
}
bool RepSetIterator::initialize(){
for( size_t i=0; i<d_types.size(); i++ ){
d_index.push_back( 0 );
//store default index order
d_index_order.push_back( i );
d_var_order[i] = i;
//store default domain
d_domain.push_back( RepDomain() );
TypeNode tn = d_types[i];
if( tn.isSort() ){
if( !d_rep_set->hasType( tn ) ){
Node var = NodeManager::currentNM()->mkSkolem( "repSet", tn, "is a variable created by the RepSetIterator" );
Trace("mkVar") << "RepSetIterator:: Make variable " << var << " : " << tn << std::endl;
d_rep_set->add( tn, var );
}
}else if( tn.isInteger() ){
bool inc = false;
//check if it is bound
if( d_owner.getKind()==FORALL && d_qe && d_qe->getBoundedIntegers() ){
if( d_qe->getBoundedIntegers()->isBoundVar( d_owner, d_owner[0][i] ) ){
Trace("bound-int-rsi") << "Rep set iterator: variable #" << i << " is bounded integer." << std::endl;
d_enum_type.push_back( ENUM_RANGE );
}else{
inc = true;
}
}else{
inc = true;
}
if( inc ){
//check if it is otherwise bound
if( d_bounds[0].find(i)!=d_bounds[0].end() && d_bounds[1].find(i)!=d_bounds[1].end() ){
Trace("bound-int-rsi") << "Rep set iterator: variable #" << i << " is bounded." << std::endl;
d_enum_type.push_back( ENUM_RANGE );
}else{
Trace("fmf-incomplete") << "Incomplete because of integer quantification of " << d_owner[0][i] << "." << std::endl;
d_incomplete = true;
}
}
//enumerate if the sort is reasonably small, the upper bound of 1000 is chosen arbitrarily for now
}else if( tn.getCardinality().isFinite() && !tn.getCardinality().isLargeFinite() &&
tn.getCardinality().getFiniteCardinality().toUnsignedInt()<=1000 ){
d_rep_set->complete( tn );
}else{
Trace("fmf-incomplete") << "Incomplete because of quantification of type " << tn << std::endl;
d_incomplete = true;
}
if( d_enum_type.size()<=i ){
d_enum_type.push_back( ENUM_DOMAIN_ELEMENTS );
if( d_rep_set->hasType( tn ) ){
for( size_t j=0; j<d_rep_set->d_type_reps[tn].size(); j++ ){
d_domain[i].push_back( j );
}
}else{
return false;
}
}
}
//must set a variable index order based on bounded integers
if (d_owner.getKind()==FORALL && d_qe && d_qe->getBoundedIntegers()) {
Trace("bound-int-rsi") << "Calculating variable order..." << std::endl;
std::vector< int > varOrder;
for( unsigned i=0; i<d_qe->getBoundedIntegers()->getNumBoundVars(d_owner); i++ ){
varOrder.push_back(d_qe->getBoundedIntegers()->getBoundVarNum(d_owner,i));
}
for( unsigned i=0; i<d_owner[0].getNumChildren(); i++) {
if( !d_qe->getBoundedIntegers()->isBoundVar(d_owner, d_owner[0][i])) {
varOrder.push_back(i);
}
}
Trace("bound-int-rsi") << "Variable order : ";
for( unsigned i=0; i<varOrder.size(); i++) {
Trace("bound-int-rsi") << varOrder[i] << " ";
}
Trace("bound-int-rsi") << std::endl;
std::vector< int > indexOrder;
indexOrder.resize(varOrder.size());
for( unsigned i=0; i<varOrder.size(); i++){
indexOrder[varOrder[i]] = i;
}
Trace("bound-int-rsi") << "Will use index order : ";
for( unsigned i=0; i<indexOrder.size(); i++) {
Trace("bound-int-rsi") << indexOrder[i] << " ";
}
Trace("bound-int-rsi") << std::endl;
setIndexOrder(indexOrder);
}
//now reset the indices
for (unsigned i=0; i<d_index.size(); i++) {
if (!resetIndex(i, true)){
break;
}
}
return true;
}
void SharedTermsVisitor::visit(TNode current, TNode parent) {
Debug("register") << "SharedTermsVisitor::visit(" << current << "," << parent << ")" << std::endl;
if (Debug.isOn("register::internal")) {
Debug("register::internal") << toString() << std::endl;
}
// Get the theories of the terms
TheoryId currentTheoryId = Theory::theoryOf(current);
TheoryId parentTheoryId = Theory::theoryOf(parent);
#if 0
bool useType = current != parent && currentTheoryId != parentTheoryId;
#else
// Should we use the theory of the type
bool useType = false;
TheoryId typeTheoryId = THEORY_LAST;
if (current != parent) {
if (currentTheoryId != parentTheoryId) {
// If enclosed by different theories it's shared -- in read(a, f(a)) f(a) should be shared with integers
TypeNode type = current.getType();
useType = true;
typeTheoryId = Theory::theoryOf(type);
} else {
TypeNode type = current.getType();
typeTheoryId = Theory::theoryOf(type);
if (typeTheoryId != currentTheoryId) {
if (options::finiteModelFind() && type.isSort()) {
// We're looking for finite models
useType = true;
} else {
Cardinality card = type.getCardinality();
if (card.isFinite()) {
useType = true;
}
}
}
}
}
#endif
Theory::Set visitedTheories = d_visited[current];
Debug("register::internal") << "SharedTermsVisitor::visit(" << current << "," << parent << "): previously registered with " << Theory::setToString(visitedTheories) << std::endl;
if (!Theory::setContains(currentTheoryId, visitedTheories)) {
visitedTheories = Theory::setInsert(currentTheoryId, visitedTheories);
Debug("register::internal") << "SharedTermsVisitor::visit(" << current << "," << parent << "): adding " << currentTheoryId << std::endl;
}
if (!Theory::setContains(parentTheoryId, visitedTheories)) {
visitedTheories = Theory::setInsert(parentTheoryId, visitedTheories);
Debug("register::internal") << "SharedTermsVisitor::visit(" << current << "," << parent << "): adding " << parentTheoryId << std::endl;
}
if (useType) {
//////TheoryId typeTheoryId = Theory::theoryOf(current.getType());
if (!Theory::setContains(typeTheoryId, visitedTheories)) {
visitedTheories = Theory::setInsert(typeTheoryId, visitedTheories);
Debug("register::internal") << "SharedTermsVisitor::visit(" << current << "," << parent << "): adding " << typeTheoryId << std::endl;
}
}
Debug("register::internal") << "SharedTermsVisitor::visit(" << current << "," << parent << "): now registered with " << Theory::setToString(visitedTheories) << std::endl;
// Record the new theories that we visited
d_visited[current] = visitedTheories;
// If there is more than two theories and a new one has been added notify the shared terms database
if (Theory::setDifference(visitedTheories, Theory::setInsert(currentTheoryId))) {
d_sharedTerms.addSharedTerm(d_atom, current, visitedTheories);
}
Assert(d_visited.find(current) != d_visited.end());
Assert(alreadyVisited(current, parent));
}
bool SharedTermsVisitor::alreadyVisited(TNode current, TNode parent) const {
Debug("register::internal") << "SharedTermsVisitor::alreadyVisited(" << current << "," << parent << ")" << std::endl;
if( ( parent.getKind() == kind::FORALL ||
parent.getKind() == kind::EXISTS ||
parent.getKind() == kind::REWRITE_RULE /*||
parent.getKind() == kind::CARDINALITY_CONSTRAINT*/ ) &&
current != parent ) {
Debug("register::internal") << "quantifier:true" << std::endl;
return true;
}
TNodeVisitedMap::const_iterator find = d_visited.find(current);
// If node is not visited at all, just return false
if (find == d_visited.end()) {
Debug("register::internal") << "1:false" << std::endl;
return false;
}
Theory::Set theories = (*find).second;
TheoryId currentTheoryId = Theory::theoryOf(current);
TheoryId parentTheoryId = Theory::theoryOf(parent);
// Should we use the theory of the type
#if 0
bool useType = current != parent && currentTheoryId != parentTheoryId;
#else
bool useType = false;
TheoryId typeTheoryId = THEORY_LAST;
if (current != parent) {
if (currentTheoryId != parentTheoryId) {
// If enclosed by different theories it's shared -- in read(a, f(a)) f(a) should be shared with integers
TypeNode type = current.getType();
useType = true;
typeTheoryId = Theory::theoryOf(type);
} else {
TypeNode type = current.getType();
typeTheoryId = Theory::theoryOf(type);
if (typeTheoryId != currentTheoryId) {
if (options::finiteModelFind() && type.isSort()) {
// We're looking for finite models
useType = true;
} else {
Cardinality card = type.getCardinality();
if (card.isFinite()) {
useType = true;
}
}
}
}
}
#endif
if (Theory::setContains(currentTheoryId, theories)) {
if (Theory::setContains(parentTheoryId, theories)) {
if (useType) {
////TheoryId typeTheoryId = Theory::theoryOf(current.getType());
return Theory::setContains(typeTheoryId, theories);
} else {
return true;
}
} else {
return false;
}
} else {
return false;
}
}