/** pre register quantifier */
void QuantDSplit::preRegisterQuantifier( Node q ) {
int max_index = -1;
int max_score = -1;
if( q.getNumChildren()==3 ){
return;
}
Trace("quant-dsplit-debug") << "Check split quantified formula : " << q << std::endl;
for( unsigned i=0; i<q[0].getNumChildren(); i++ ){
TypeNode tn = q[0][i].getType();
if( tn.isDatatype() ){
const Datatype& dt = ((DatatypeType)(tn).toType()).getDatatype();
if( dt.isRecursiveSingleton() ){
Trace("quant-dsplit-debug") << "Datatype " << dt.getName() << " is recursive singleton." << std::endl;
}else{
int score = -1;
if( options::quantDynamicSplit()==quantifiers::QUANT_DSPLIT_MODE_AGG ){
score = dt.isUFinite() ? 1 : -1;
}else if( options::quantDynamicSplit()==quantifiers::QUANT_DSPLIT_MODE_DEFAULT ){
score = dt.isUFinite() ? 1 : -1;
}
Trace("quant-dsplit-debug") << "Datatype " << dt.getName() << " is score " << score << " (" << dt.isUFinite() << " " << dt.isFinite() << ")" << std::endl;
if( score>max_score ){
max_index = i;
max_score = score;
}
}
}
}
if( max_index!=-1 ){
Trace("quant-dsplit-debug") << "Will split at index " << max_index << "." << std::endl;
d_quant_to_reduce[q] = max_index;
d_quantEngine->setOwner( q, this );
}
}
/* Call during quantifier engine's check */
void QuantDSplit::check( Theory::Effort e, unsigned quant_e ) {
//add lemmas ASAP (they are a reduction)
if( quant_e==QuantifiersEngine::QEFFORT_CONFLICT ){
std::vector< Node > lemmas;
for(std::map< Node, int >::iterator it = d_quant_to_reduce.begin(); it != d_quant_to_reduce.end(); ++it) {
Node q = it->first;
if( d_added_split.find( q )==d_added_split.end() ){
d_added_split.insert( q );
std::vector< Node > bvs;
for( unsigned i=0; i<q[0].getNumChildren(); i++ ){
if( (int)i!=it->second ){
bvs.push_back( q[0][i] );
}
}
std::vector< Node > disj;
disj.push_back( q.negate() );
TNode svar = q[0][it->second];
TypeNode tn = svar.getType();
if( tn.isDatatype() ){
std::vector< Node > cons;
const Datatype& dt = ((DatatypeType)(tn).toType()).getDatatype();
for( unsigned j=0; j<dt.getNumConstructors(); j++ ){
std::vector< Node > vars;
for( unsigned k=0; k<dt[j].getNumArgs(); k++ ){
TypeNode tns = TypeNode::fromType( dt[j][k].getRangeType() );
Node v = NodeManager::currentNM()->mkBoundVar( tns );
vars.push_back( v );
}
std::vector< Node > bvs_cmb;
bvs_cmb.insert( bvs_cmb.end(), bvs.begin(), bvs.end() );
bvs_cmb.insert( bvs_cmb.end(), vars.begin(), vars.end() );
vars.insert( vars.begin(), Node::fromExpr( dt[j].getConstructor() ) );
Node c = NodeManager::currentNM()->mkNode( kind::APPLY_CONSTRUCTOR, vars );
TNode ct = c;
Node body = q[1].substitute( svar, ct );
if( !bvs_cmb.empty() ){
body = NodeManager::currentNM()->mkNode( kind::FORALL, NodeManager::currentNM()->mkNode( kind::BOUND_VAR_LIST, bvs_cmb ), body );
}
cons.push_back( body );
}
Node conc = cons.size()==1 ? cons[0] : NodeManager::currentNM()->mkNode( kind::AND, cons );
disj.push_back( conc );
}else{
Assert( false );
}
lemmas.push_back( disj.size()==1 ? disj[0] : NodeManager::currentNM()->mkNode( kind::OR, disj ) );
}
}
//add lemmas to quantifiers engine
for( unsigned i=0; i<lemmas.size(); i++ ){
Trace("quant-dsplit") << "QuantDSplit lemma : " << lemmas[i] << std::endl;
d_quantEngine->addLemma( lemmas[i], false );
}
d_quant_to_reduce.clear();
}
}
Node ModelPostprocessor::rewriteAs(TNode n, TypeNode asType) {
if(n.getType().isSubtypeOf(asType)) {
// good to go, we have the right type
return n;
}
if(!n.isConst()) {
// we don't handle non-const right now
return n;
}
if(asType.isBoolean()) {
if(n.getType().isBitVector(1u)) {
// type mismatch: should only happen for Boolean-term conversion under
// datatype constructor applications; rewrite from BV(1) back to Boolean
bool tf = (n.getConst<BitVector>().getValue() == 1);
return NodeManager::currentNM()->mkConst(tf);
}
if(n.getType().isDatatype() && n.getType().hasAttribute(BooleanTermAttr())) {
// type mismatch: should only happen for Boolean-term conversion under
// datatype constructor applications; rewrite from datatype back to Boolean
Assert(n.getKind() == kind::APPLY_CONSTRUCTOR);
Assert(n.getNumChildren() == 0);
// we assume (by construction) false is first; see boolean_terms.cpp
bool tf = (Datatype::indexOf(n.getOperator().toExpr()) == 1);
Debug("boolean-terms") << "+++ rewriteAs " << n << " : " << asType << " ==> " << tf << endl;
return NodeManager::currentNM()->mkConst(tf);
}
}
if(n.getType().isBoolean()) {
bool tf = n.getConst<bool>();
if(asType.isBitVector(1u)) {
return NodeManager::currentNM()->mkConst(BitVector(1u, tf ? 1u : 0u));
}
if(asType.isDatatype() && asType.hasAttribute(BooleanTermAttr())) {
const Datatype& asDatatype = asType.getConst<Datatype>();
return NodeManager::currentNM()->mkNode(kind::APPLY_CONSTRUCTOR, (tf ? asDatatype[0] : asDatatype[1]).getConstructor());
}
}
if(n.getType().isRecord() && asType.isRecord()) {
Debug("boolean-terms") << "+++ got a record - rewriteAs " << n << " : " << asType << endl;
const Record& rec CVC4_UNUSED = n.getType().getConst<Record>();
const Record& asRec = asType.getConst<Record>();
Assert(rec.getNumFields() == asRec.getNumFields());
Assert(n.getNumChildren() == asRec.getNumFields());
NodeBuilder<> b(n.getKind());
b << asType;
for(size_t i = 0; i < n.getNumChildren(); ++i) {
b << rewriteAs(n[i], TypeNode::fromType(asRec[i].second));
}
Node out = b;
Debug("boolean-terms") << "+++ returning record " << out << endl;
return out;
}
void SygusRedundantCons::initialize(QuantifiersEngine* qe, TypeNode tn)
{
Assert(qe != nullptr);
Trace("sygus-red") << "Compute redundant cons for " << tn << std::endl;
d_type = tn;
Assert(tn.isDatatype());
TermDbSygus* tds = qe->getTermDatabaseSygus();
tds->registerSygusType(tn);
const Datatype& dt = static_cast<DatatypeType>(tn.toType()).getDatatype();
Assert(dt.isSygus());
TypeNode btn = TypeNode::fromType(dt.getSygusType());
for (unsigned i = 0, ncons = dt.getNumConstructors(); i < ncons; i++)
{
Trace("sygus-red") << " Is " << dt[i].getName() << " a redundant operator?"
<< std::endl;
std::map<int, Node> pre;
Node g = tds->mkGeneric(dt, i, pre);
Trace("sygus-red-debug") << " ...pre-rewrite : " << g << std::endl;
Assert(g.getNumChildren() == dt[i].getNumArgs());
d_gen_terms[i] = g;
for (unsigned j = 0, nargs = dt[i].getNumArgs(); j < nargs; j++)
{
pre[j] = g[j];
}
std::vector<Node> glist;
getGenericList(tds, dt, i, 0, pre, glist);
// call the extended rewriter
bool red = false;
for (const Node& gr : glist)
{
Trace("sygus-red-debug") << " ...variant : " << gr << std::endl;
std::map<Node, unsigned>::iterator itg = d_gen_cons.find(gr);
if (itg != d_gen_cons.end() && itg->second != i)
{
red = true;
Trace("sygus-red") << " ......redundant, since a variant of " << g
<< " and " << d_gen_terms[itg->second]
<< " both rewrite to " << gr << std::endl;
break;
}
else
{
d_gen_cons[gr] = i;
Trace("sygus-red") << " ......not redundant." << std::endl;
}
}
d_sygus_red_status.push_back(red ? 1 : 0);
}
}
bool InstStrategyCbqi::hasNonCbqiVariable( Node q ){
for( unsigned i=0; i<q[0].getNumChildren(); i++ ){
TypeNode tn = q[0][i].getType();
if( !tn.isInteger() && !tn.isReal() && !tn.isBoolean() ){
if( options::cbqiSplx() ){
return true;
}else{
//datatypes supported in new implementation
if( !tn.isDatatype() ){
return true;
}
}
}
}
return false;
}
bool TermEnumeration::isClosedEnumerableType(TypeNode tn)
{
std::unordered_map<TypeNode, bool, TypeNodeHashFunction>::iterator it =
d_typ_closed_enum.find(tn);
if (it == d_typ_closed_enum.end())
{
d_typ_closed_enum[tn] = true;
bool ret = true;
if (tn.isArray() || tn.isSort() || tn.isCodatatype() || tn.isFunction())
{
ret = false;
}
else if (tn.isSet())
{
ret = isClosedEnumerableType(tn.getSetElementType());
}
else if (tn.isDatatype())
{
const Datatype& dt = ((DatatypeType)(tn).toType()).getDatatype();
for (unsigned i = 0; i < dt.getNumConstructors(); i++)
{
for (unsigned j = 0; j < dt[i].getNumArgs(); j++)
{
TypeNode ctn = TypeNode::fromType(dt[i][j].getRangeType());
if (tn != ctn && !isClosedEnumerableType(ctn))
{
ret = false;
break;
}
}
if (!ret)
{
break;
}
}
}
// other parametric sorts go here
d_typ_closed_enum[tn] = ret;
return ret;
}
else
{
return it->second;
}
}
Node DatatypesEnumerator::getTermEnum( TypeNode tn, unsigned i ){
Node ret;
if( i<d_terms[tn].size() ){
ret = d_terms[tn][i];
}else{
Debug("dt-enum-debug") << "get term enum " << tn << " " << i << std::endl;
std::map< TypeNode, unsigned >::iterator it = d_te_index.find( tn );
unsigned tei;
if( it==d_te_index.end() ){
//initialize child enumerator for type
tei = d_children.size();
d_te_index[tn] = tei;
if( tn.isDatatype() && d_has_debruijn ){
//must indicate that this is a child enumerator (do not normalize constants for it)
DatatypesEnumerator * dte = new DatatypesEnumerator( tn, true );
d_children.push_back( TypeEnumerator( dte ) );
}else{
d_children.push_back( TypeEnumerator( tn ) );
}
d_terms[tn].push_back( *d_children[tei] );
}else{
tei = it->second;
}
//enumerate terms until index is reached
while( i>=d_terms[tn].size() ){
++d_children[tei];
if( d_children[tei].isFinished() ){
Debug("dt-enum-debug") << "...fail term enum " << tn << " " << i << std::endl;
return Node::null();
}
d_terms[tn].push_back( *d_children[tei] );
}
Debug("dt-enum-debug") << "...return term enum " << tn << " " << i << " : " << d_terms[tn][i] << std::endl;
ret = d_terms[tn][i];
}
return ret;
}