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/********************* */
/*! \file theory_quantifiers.cpp
** \verbatim
** Original author: Morgan Deters
** Major contributors: none
** Minor contributors (to current version): Dejan Jovanovic, Andrew Reynolds
** This file is part of the CVC4 project.
** Copyright (c) 2009-2013 New York University and The University of Iowa
** See the file COPYING in the top-level source directory for licensing
** information.\endverbatim
**
** \brief Implementation of the theory of quantifiers
**
** Implementation of the theory of quantifiers.
**/
#include "theory/quantifiers/theory_quantifiers.h"
#include "theory/valuation.h"
#include "theory/quantifiers_engine.h"
#include "theory/quantifiers/instantiation_engine.h"
#include "theory/quantifiers/model_engine.h"
#include "expr/kind.h"
#include "util/cvc4_assert.h"
#include "theory/quantifiers/options.h"
#include "theory/quantifiers/term_database.h"
#include "theory/quantifiers/quantifiers_attributes.h"
using namespace std;
using namespace CVC4;
using namespace CVC4::kind;
using namespace CVC4::context;
using namespace CVC4::theory;
using namespace CVC4::theory::quantifiers;
TheoryQuantifiers::TheoryQuantifiers(Context* c, context::UserContext* u, OutputChannel& out, Valuation valuation, const LogicInfo& logicInfo, QuantifiersEngine* qe) :
Theory(THEORY_QUANTIFIERS, c, u, out, valuation, logicInfo, qe),
d_numRestarts(0),
d_masterEqualityEngine(0)
{
d_numInstantiations = 0;
d_baseDecLevel = -1;
out.handleUserAttribute( "axiom", this );
out.handleUserAttribute( "conjecture", this );
}
TheoryQuantifiers::~TheoryQuantifiers() {
}
void TheoryQuantifiers::setMasterEqualityEngine(eq::EqualityEngine* eq) {
d_masterEqualityEngine = eq;
}
void TheoryQuantifiers::addSharedTerm(TNode t) {
Debug("quantifiers-other") << "TheoryQuantifiers::addSharedTerm(): "
<< t << endl;
}
void TheoryQuantifiers::notifyEq(TNode lhs, TNode rhs) {
Debug("quantifiers-other") << "TheoryQuantifiers::notifyEq(): "
<< lhs << " = " << rhs << endl;
}
void TheoryQuantifiers::preRegisterTerm(TNode n) {
Debug("quantifiers-prereg") << "TheoryQuantifiers::preRegisterTerm() " << n << endl;
if( n.getKind()==FORALL && !n.hasAttribute(InstConstantAttribute()) ){
getQuantifiersEngine()->registerQuantifier( n );
}
}
void TheoryQuantifiers::presolve() {
Debug("quantifiers-presolve") << "TheoryQuantifiers::presolve()" << endl;
}
Node TheoryQuantifiers::getValue(TNode n) {
//NodeManager* nodeManager = NodeManager::currentNM();
switch(n.getKind()) {
case FORALL:
case EXISTS:
bool value;
if( d_valuation.hasSatValue( n, value ) ){
return NodeManager::currentNM()->mkConst(value);
}else{
return NodeManager::currentNM()->mkConst(false); //FIX_THIS?
}
break;
default:
Unhandled(n.getKind());
}
}
void TheoryQuantifiers::collectModelInfo(TheoryModel* m, bool fullModel) {
if(fullModel) {
for(assertions_iterator i = facts_begin(); i != facts_end(); ++i) {
if((*i).assertion.getKind() == kind::NOT) {
Debug("quantifiers::collectModelInfo") << "got quant FALSE: " << (*i).assertion[0] << endl;
m->assertPredicate((*i).assertion[0], false);
} else {
Debug("quantifiers::collectModelInfo") << "got quant TRUE : " << *i << endl;
m->assertPredicate(*i, true);
}
}
}
}
void TheoryQuantifiers::check(Effort e) {
CodeTimer codeTimer(d_theoryTime);
Debug("quantifiers-check") << "quantifiers::check(" << e << ")" << std::endl;
while(!done()) {
Node assertion = get();
Debug("quantifiers-assert") << "quantifiers::assert(): " << assertion << std::endl;
switch(assertion.getKind()) {
case kind::FORALL:
assertUniversal( assertion );
break;
case kind::NOT:
{
switch( assertion[0].getKind()) {
case kind::FORALL:
assertExistential( assertion );
break;
default:
Unhandled(assertion[0].getKind());
break;
}
}
break;
default:
Unhandled(assertion.getKind());
break;
}
}
// call the quantifiers engine to check
getQuantifiersEngine()->check( e );
}
void TheoryQuantifiers::propagate(Effort level){
//CodeTimer codeTimer(d_theoryTime);
//getQuantifiersEngine()->propagate( level );
}
Node TheoryQuantifiers::getNextDecisionRequest(){
return getQuantifiersEngine()->getNextDecisionRequest();
}
void TheoryQuantifiers::assertUniversal( Node n ){
Assert( n.getKind()==FORALL );
if( !n.hasAttribute(InstConstantAttribute()) ){
getQuantifiersEngine()->registerQuantifier( n );
getQuantifiersEngine()->assertNode( n );
}
}
void TheoryQuantifiers::assertExistential( Node n ){
Assert( n.getKind()== NOT && n[0].getKind()==FORALL );
if( !n[0].hasAttribute(InstConstantAttribute()) ){
if( d_skolemized.find( n )==d_skolemized.end() ){
Node body = getQuantifiersEngine()->getTermDatabase()->getSkolemizedBody( n[0] );
NodeBuilder<> nb(kind::OR);
nb << n[0] << body.notNode();
Node lem = nb;
Debug("quantifiers-sk") << "Skolemize lemma : " << lem << std::endl;
d_out->lemma( lem );
d_skolemized[n] = true;
}
}
}
bool TheoryQuantifiers::flipDecision(){
//Debug("quantifiers-flip") << "No instantiation given, flip decision, level = " << d_valuation.getDecisionLevel() << std::endl;
//for( int i=1; i<=(int)d_valuation.getDecisionLevel(); i++ ){
// Debug("quantifiers-flip") << " " << d_valuation.getDecision( i ) << std::endl;
//}
//if( d_valuation.getDecisionLevel()>0 ){
// double r = double(rand())/double(RAND_MAX);
// unsigned decisionLevel = (unsigned)(r*d_valuation.getDecisionLevel());
// d_out->flipDecision( decisionLevel );
// return true;
//}else{
// return false;
//}
if( !d_out->flipDecision() ){
return restart();
}
return true;
}
bool TheoryQuantifiers::restart(){
static const int restartLimit = 0;
if( d_numRestarts==restartLimit ){
Debug("quantifiers-flip") << "No more restarts." << std::endl;
return false;
}else{
d_numRestarts++;
Debug("quantifiers-flip") << "Do restart." << std::endl;
return true;
}
}
void TheoryQuantifiers::setUserAttribute( const std::string& attr, Node n ){
QuantifiersAttributes::setUserAttribute( attr, n );
}
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