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/******************************************************************************
* Top contributors (to current version):
* Michael Chang, Yancheng Ou, Aina Niemetz
*
* This file is part of the cvc5 project.
*
* Copyright (c) 2009-2021 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.
* ****************************************************************************
*
* The solver for optimization queries.
*/
#include "smt/optimization_solver.h"
#include "omt/omt_optimizer.h"
using namespace cvc5::theory;
using namespace cvc5::omt;
namespace cvc5 {
namespace smt {
/**
* d_activatedObjective is initialized to a default objective:
* default objective constructed with Null Node and OBJECTIVE_UNDEFINED
*
* d_savedValue is initialized to a default node (Null Node)
*/
OptimizationSolver::OptimizationSolver(SmtEngine* parent)
: d_parent(parent),
d_activatedObjective(Node(), ObjectiveType::OBJECTIVE_UNDEFINED),
d_savedValue()
{
}
OptimizationSolver::~OptimizationSolver() {}
OptResult OptimizationSolver::checkOpt()
{
// Make sure that the objective is not the default one
Assert(d_activatedObjective.getType() != ObjectiveType::OBJECTIVE_UNDEFINED);
Assert(!d_activatedObjective.getNode().isNull());
std::unique_ptr<OMTOptimizer> optimizer = OMTOptimizer::getOptimizerForNode(
d_activatedObjective.getNode(), d_activatedObjective.getSigned());
Assert(optimizer != nullptr);
std::pair<OptResult, Node> optResult;
if (d_activatedObjective.getType() == ObjectiveType::OBJECTIVE_MAXIMIZE)
{
optResult = optimizer->maximize(this->d_parent,
this->d_activatedObjective.getNode());
}
else if (d_activatedObjective.getType() == ObjectiveType::OBJECTIVE_MINIMIZE)
{
optResult = optimizer->minimize(this->d_parent,
this->d_activatedObjective.getNode());
}
this->d_savedValue = optResult.second;
return optResult.first;
}
void OptimizationSolver::activateObj(const Node& obj,
const ObjectiveType type,
bool bvSigned)
{
d_activatedObjective = Objective(obj, type, bvSigned);
}
Node OptimizationSolver::objectiveGetValue()
{
Assert(!d_savedValue.isNull());
return d_savedValue;
}
Objective::Objective(Node obj, ObjectiveType type, bool bvSigned)
: d_type(type), d_node(obj), d_bvSigned(bvSigned)
{
}
ObjectiveType Objective::getType() { return d_type; }
Node Objective::getNode() { return d_node; }
bool Objective::getSigned() { return d_bvSigned; }
} // namespace smt
} // namespace cvc5
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