private Dictionary <string, bool> Solve(List <Clause> clauses, SolverType type)
{
Dictionary <string, bool> solution;
SolverStatus status;
if (type == SolverType.SAT)
{
solution = SolveSAT(clauses, out status);
}
else if (type == SolverType.mhs)
{
solution = SolveMHS(clauses, out status);
}
else if (type == SolverType.MaxSAT)
{
solution = SolveMaxSAT(clauses, out status);
}
else
{
throw new RepairException("Invalid solver type!");
}
ClauseLogger.Log(clauses, type, solution);
if (status == SolverStatus.Unsatisfiable)
{
throw new RepairException("The program could not be repaired because of unsatisfiable clauses!");
}
return(solution);
}
/// <summary>
/// Determine the optimized barrier assignments based on the error traces.
/// </summary>
/// <param name="errors">The errors.</param>
/// <param name="solution">The solution obtained so far.</param>
/// <param name="type">The solver type used.</param>
/// <returns>The barrier assignments.</returns>
public Dictionary <string, bool> Optimize(
List <RepairableError> errors, Dictionary <string, bool> solution, out SolverType type)
{
List <Clause> clauses = GenerateClauses(errors);
Dictionary <string, int> coeffs = new Dictionary <string, int>();
foreach (Barrier barrier in ProgramMetadata.Barriers.Values)
{
coeffs.Add(barrier.Name, barrier.Weight);
}
type = SolverType.Optimizer;
while (true)
{
int total_weight = 0;
foreach (string key in solution.Where(x => x.Value == true).Select(x => x.Key))
{
total_weight += coeffs[key];
}
using (Watch watch = new Watch(Measure.Optimization))
{
SolverStatus status;
Optimizer optimizer = new Optimizer(clauses, coeffs);
Dictionary <string, bool> assignments = optimizer.Solve(--total_weight, out status);
if (status == SolverStatus.Unsatisfiable)
{
ClauseLogger.Log(clauses, type, solution);
return(solution);
}
else
{
solution = assignments;
}
}
}
}