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/********************* */
/*! \file decision_engine.cpp
** \verbatim
** Top contributors (to current version):
** Kshitij Bansal, Tim King, Morgan Deters
** This file is part of the CVC4 project.
** Copyright (c) 2009-2018 by the authors listed in the file AUTHORS
** in the top-level source directory) and their institutional affiliations.
** All rights reserved. See the file COPYING in the top-level source
** directory for licensing information.\endverbatim
**
** \brief Decision engine
**
** Decision engine
**/
#include "decision/decision_engine.h"
#include "decision/decision_attributes.h"
#include "decision/justification_heuristic.h"
#include "expr/node.h"
#include "options/decision_mode.h"
#include "options/decision_options.h"
#include "options/smt_options.h"
using namespace std;
namespace CVC4 {
DecisionEngine::DecisionEngine(context::Context *sc,
context::UserContext *uc) :
d_enabledStrategies(),
d_needIteSkolemMap(),
d_relevancyStrategy(NULL),
d_assertions(uc),
d_cnfStream(NULL),
d_satSolver(NULL),
d_satContext(sc),
d_userContext(uc),
d_result(sc, SAT_VALUE_UNKNOWN),
d_engineState(0)
{
Trace("decision") << "Creating decision engine" << std::endl;
}
void DecisionEngine::init()
{
Assert(d_engineState == 0);
d_engineState = 1;
Trace("decision-init") << "DecisionEngine::init()" << std::endl;
Trace("decision-init") << " * options->decisionMode: "
<< options::decisionMode() << std:: endl;
Trace("decision-init") << " * options->decisionStopOnly: "
<< options::decisionStopOnly() << std::endl;
if(options::decisionMode() == decision::DECISION_STRATEGY_INTERNAL) { }
if(options::decisionMode() == decision::DECISION_STRATEGY_JUSTIFICATION) {
ITEDecisionStrategy* ds =
new decision::JustificationHeuristic(this, d_userContext, d_satContext);
enableStrategy(ds);
d_needIteSkolemMap.push_back(ds);
}
}
void DecisionEngine::enableStrategy(DecisionStrategy* ds)
{
d_enabledStrategies.push_back(ds);
}
void DecisionEngine::clearStrategies(){
for(unsigned i = 0; i < d_enabledStrategies.size(); ++i){
delete d_enabledStrategies[i];
}
d_enabledStrategies.clear();
d_needIteSkolemMap.clear();
}
bool DecisionEngine::isRelevant(SatVariable var)
{
Debug("decision") << "isRelevant(" << var <<")" << std::endl;
if(d_relevancyStrategy != NULL) {
//Assert(d_cnfStream->hasNode(var));
return d_relevancyStrategy->isRelevant( d_cnfStream->getNode(SatLiteral(var)) );
} else {
return true;
}
}
SatValue DecisionEngine::getPolarity(SatVariable var)
{
Debug("decision") << "getPolarity(" << var <<")" << std::endl;
if(d_relevancyStrategy != NULL) {
Assert(isRelevant(var));
return d_relevancyStrategy->getPolarity( d_cnfStream->getNode(SatLiteral(var)) );
} else {
return SAT_VALUE_UNKNOWN;
}
}
void DecisionEngine::addAssertions(const vector<Node> &assertions)
{
Assert(false); // doing this so that we revisit what to do
// here. Currently not being used.
// d_result = SAT_VALUE_UNKNOWN;
// d_assertions.reserve(assertions.size());
// for(unsigned i = 0; i < assertions.size(); ++i)
// d_assertions.push_back(assertions[i]);
}
void DecisionEngine::addAssertions(const vector<Node> &assertions,
unsigned assertionsEnd,
IteSkolemMap iteSkolemMap)
{
// new assertions, reset whatever result we knew
d_result = SAT_VALUE_UNKNOWN;
// d_assertions.reserve(assertions.size());
for(unsigned i = 0; i < assertions.size(); ++i)
d_assertions.push_back(assertions[i]);
for(unsigned i = 0; i < d_needIteSkolemMap.size(); ++i)
d_needIteSkolemMap[i]->
addAssertions(assertions, assertionsEnd, iteSkolemMap);
}
}/* CVC4 namespace */
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