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/********************* */
/*! \file decision_engine.cpp
** \verbatim
** Top contributors (to current version):
** Kshitij Bansal, Aina Niemetz, Andres Noetzli
** This file is part of the CVC4 project.
** Copyright (c) 2009-2020 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_options.h"
#include "options/smt_options.h"
using namespace std;
namespace CVC4 {
DecisionEngine::DecisionEngine(context::Context* sc,
context::UserContext* uc,
ResourceManager* rm)
: d_enabledITEStrategy(nullptr),
d_needIteSkolemMap(),
d_relevancyStrategy(nullptr),
d_assertions(uc),
d_cnfStream(nullptr),
d_satSolver(nullptr),
d_satContext(sc),
d_userContext(uc),
d_result(sc, SAT_VALUE_UNKNOWN),
d_engineState(0),
d_resourceManager(rm)
{
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() == options::DecisionMode::JUSTIFICATION)
{
d_enabledITEStrategy.reset(new decision::JustificationHeuristic(
this, d_userContext, d_satContext));
d_needIteSkolemMap.push_back(d_enabledITEStrategy.get());
}
}
void DecisionEngine::shutdown()
{
Trace("decision") << "Shutting down decision engine" << std::endl;
Assert(d_engineState == 1);
d_engineState = 2;
d_enabledITEStrategy.reset(nullptr);
d_needIteSkolemMap.clear();
}
SatLiteral DecisionEngine::getNext(bool& stopSearch)
{
d_resourceManager->spendResource(ResourceManager::Resource::DecisionStep);
Assert(d_cnfStream != nullptr)
<< "Forgot to set cnfStream for decision engine?";
Assert(d_satSolver != nullptr)
<< "Forgot to set satSolver for decision engine?";
return d_enabledITEStrategy == nullptr
? undefSatLiteral
: d_enabledITEStrategy->getNext(stopSearch);
}
bool DecisionEngine::isRelevant(SatVariable var)
{
Debug("decision") << "isRelevant(" << var <<")" << std::endl;
if (d_relevancyStrategy != nullptr)
{
//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 != nullptr)
{
Assert(isRelevant(var));
return d_relevancyStrategy->getPolarity( d_cnfStream->getNode(SatLiteral(var)) );
}
else
{
return SAT_VALUE_UNKNOWN;
}
}
void DecisionEngine::addAssertions(const std::vector<Node>& assertions,
const std::vector<Node>& ppLemmas,
const std::vector<Node>& ppSkolems)
{
// new assertions, reset whatever result we knew
d_result = SAT_VALUE_UNKNOWN;
for (const Node& assertion : assertions)
{
d_assertions.push_back(assertion);
}
for(unsigned i = 0; i < d_needIteSkolemMap.size(); ++i)
{
d_needIteSkolemMap[i]->addAssertions(assertions, ppLemmas, ppSkolems);
}
}
}/* CVC4 namespace */
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