lib/Sat/RissCore.cpp

/********************************************************************
 * AUTHORS: Vijay Ganesh, Dan Liew, Mate Soos, Norbert Manthey
 *
 * BEGIN DATE: November, 2005
 *
Permission is hereby granted, free of charge, to any person obtaining a copy
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
********************************************************************/

#define __STDC_FORMAT_MACROS
#include "stp/Sat/Riss.h"
#include "riss/core/Solver.h"
//#include "utils/System.h"
//#include "simp/SimpSolver.h"

namespace Riss
{
}
using namespace Riss;

namespace stp
{

uint8_t RissCore::value(uint32_t x) const
{
  return Riss::toInt(s->value(x));
}

RissCore::RissCore()
{
  s = new Riss::Solver;
  riss_clause = new Riss::vec<Lit>();
}

RissCore::~RissCore()
{
  delete s;
  if(riss_clause) {
    Riss::vec<Riss::Lit> *v = (Riss::vec<Riss::Lit> *)riss_clause;
    delete v;
    riss_clause = 0;
  }
}

void RissCore::setMaxConflicts(int64_t max_confl)
{
  s->setConfBudget(max_confl);
}

bool RissCore::addClause(
    const SATSolver::vec_literals& ps) // Add a clause to the solver.
{
  // convert the vector
  Riss::vec<Lit> &v = *(Riss::vec<Riss::Lit> *)riss_clause;
  v.capacity(ps.size());
  v.clear();
  for(int i = 0 ; i < ps.size(); ++ i) v.push_(Riss::toLit(Minisat::toInt(ps[i])));

  return s->addClause(v);
}

bool RissCore::okay() const // FALSE means solver is in a conflicting state
{
  return s->okay();
}

// *Doesn't solve*, just does a single unit propagate.
// returns false if UNSAT.
bool RissCore::propagateWithAssumptions(
    const stp::SATSolver::vec_literals& assumps)
{
  if (!s->simplify())
    return false;

  setMaxConflicts(0);

  // convert the vector
  Riss::vec<Lit> &v = *(Riss::vec<Riss::Lit> *)riss_clause;
  v.capacity(assumps.size());
  v.clear();
  for(int i = 0 ; i < assumps.size(); ++ i) v.push_(Riss::toLit(Minisat::toInt(assumps[i])));

  Riss::lbool ret = s->solveLimited(v);
  assert(s->conflicts ==0);
  return ret != (Riss::lbool)l_False;
}

bool RissCore::solve(bool& timeout_expired) // Search without assumptions.
{
  if (!s->simplify())
    return false;

  Riss::vec<Riss::Lit> assumps;
  Riss::lbool ret = s->solveLimited(assumps);
  if (ret == (Riss::lbool)l_Undef)
  {
    timeout_expired = true;
  }

  return ret == (Riss::lbool)l_True;
}

uint8_t RissCore::modelValue(uint32_t x) const
{
  return Riss::toInt(s->modelValue(x));
}

uint32_t RissCore::newVar()
{
  return s->newVar();
}

void RissCore::setVerbosity(int v)
{
  s->verbosity = v;
}

unsigned long RissCore::nVars() const
{
  return s->nVars();
}

void RissCore::printStats() const
{
  //s->printStats();
}

int RissCore::nClauses()
{
  return s->nClauses();
}

bool RissCore::simplify()
{
  return s->simplify();
}
}