/// <summary>
/// Can support array of array
/// </summary>
/// <param name="model"></param>
/// <returns></returns>
private ExpressionBDDEncoding TranslateArrayExpression(Model model)
{
if (this.Argument2 is IntConstant)
{
int indexValue = ((IntConstant)this.Argument2).Value;
if (Operator == ARRAY)
{
return(new Variable(this.Argument1 + Model.NAME_SEPERATOR + indexValue).TranslateIntExpToBDD(model));
}
else
{
return(new VariablePrime(this.Argument1 + Model.NAME_SEPERATOR + indexValue).TranslateIntExpToBDD(model));
}
}
ExpressionBDDEncoding indexBddEncoding = this.Argument2.TranslateIntExpToBDD(model);
//Get the array range
int min = model.GetArrayRange(this.Argument1.ExpressionID)[0];
int max = model.GetArrayRange(this.Argument1.ExpressionID)[1];
ExpressionBDDEncoding result = new ExpressionBDDEncoding();
//a[i]
for (int i = min; i <= max; i++)
{
for (int j = 0; j < indexBddEncoding.Count(); j++)
{
//index = i & guard of index
CUDD.Ref(indexBddEncoding.ExpressionDDs[j], indexBddEncoding.GuardDDs[j]);
CUDDNode guard = CUDD.Function.And(CUDD.Function.Equal(indexBddEncoding.ExpressionDDs[j], CUDD.Constant(i)),
indexBddEncoding.GuardDDs[j]);
if (guard != CUDD.ZERO)
{
//a[i]
result.GuardDDs.Add(guard);
Expression arrayExpression;
if (Operator == ARRAY)
{
arrayExpression = new Variable(this.Argument1.ExpressionID + Model.NAME_SEPERATOR + i);
}
else
{
arrayExpression = new VariablePrime(this.Argument1.ExpressionID + Model.NAME_SEPERATOR + i);
}
result.ExpressionDDs.Add(arrayExpression.TranslateIntExpToBDD(model).ExpressionDDs[0]);
}
else
{
CUDD.Deref(guard);
}
}
}
//dereference later because 2 loops above
indexBddEncoding.DeRef();
return(result);
}
/// <summary>
/// Return only guards for complete boolean expression, no expression
/// Use this when we want to encode a single assignment or the assignment does not depend other assignments.
/// </summary>
public override ExpressionBDDEncoding TranslateBoolExpToBDD(Model model)
{
ExpressionBDDEncoding result = new ExpressionBDDEncoding();
ExpressionBDDEncoding variableBddEncoding = new VariablePrime(this.LeftHandSide).TranslateIntExpToBDD(model);
ExpressionBDDEncoding valueBddEncoding = this.RightHandSide.TranslateIntExpToBDD(model);
for (int i = 0; i < variableBddEncoding.Count(); i++)
{
for (int j = 0; j < valueBddEncoding.Count(); j++)
{
CUDD.Ref(variableBddEncoding.GuardDDs[i], valueBddEncoding.GuardDDs[j]);
CUDDNode guardDD = CUDD.Function.And(variableBddEncoding.GuardDDs[i], valueBddEncoding.GuardDDs[j]);
if (guardDD.Equals(CUDD.ZERO))
{
CUDD.Deref(guardDD);
continue;
}
CUDD.Ref(variableBddEncoding.ExpressionDDs[i], valueBddEncoding.ExpressionDDs[j]);
CUDDNode assignmentDD = CUDD.Function.Equal(variableBddEncoding.ExpressionDDs[i], valueBddEncoding.ExpressionDDs[j]);
guardDD = CUDD.Function.And(guardDD, assignmentDD);
result.AddNodeToGuard(guardDD);
}
}
//remove unused expression
variableBddEncoding.DeRef();
valueBddEncoding.DeRef();
return(result);
}
/// <summary>
/// Return only guards for complete boolean expression, no expression
/// Use this when we want to encode a single assignment or the assignment does not depend other assignments.
/// </summary>
public override ExpressionBDDEncoding TranslateBoolExpToBDD(Model model)
{
ExpressionBDDEncoding result = new ExpressionBDDEncoding();
ExpressionBDDEncoding variableBddEncoding = new VariablePrime(this.LeftHandSide).TranslateIntExpToBDD(model);
ExpressionBDDEncoding valueBddEncoding = this.RightHandSide.TranslateIntExpToBDD(model);
for (int i = 0; i < variableBddEncoding.Count(); i++)
{
for (int j = 0; j < valueBddEncoding.Count(); j++)
{
CUDD.Ref(variableBddEncoding.GuardDDs[i], valueBddEncoding.GuardDDs[j]);
CUDDNode guardDD = CUDD.Function.And(variableBddEncoding.GuardDDs[i], valueBddEncoding.GuardDDs[j]);
if (guardDD.Equals(CUDD.ZERO))
{
CUDD.Deref(guardDD);
continue;
}
CUDD.Ref(variableBddEncoding.ExpressionDDs[i], valueBddEncoding.ExpressionDDs[j]);
CUDDNode assignmentDD = CUDD.Function.Equal(variableBddEncoding.ExpressionDDs[i], valueBddEncoding.ExpressionDDs[j]);
guardDD = CUDD.Function.And(guardDD, assignmentDD);
result.AddNodeToGuard(guardDD);
}
}
//remove unused expression
variableBddEncoding.DeRef();
valueBddEncoding.DeRef();
return result;
}
/// <summary>
/// Can support array of array
/// </summary>
/// <param name="model"></param>
/// <returns></returns>
private ExpressionBDDEncoding TranslateArrayExpression(Model model)
{
if (this.Argument2 is IntConstant)
{
int indexValue = ((IntConstant)this.Argument2).Value;
if(Operator == ARRAY)
{
return new Variable(this.Argument1 + Model.NAME_SEPERATOR + indexValue).TranslateIntExpToBDD(model);
}
else
{
return new VariablePrime(this.Argument1 + Model.NAME_SEPERATOR + indexValue).TranslateIntExpToBDD(model);
}
}
ExpressionBDDEncoding indexBddEncoding = this.Argument2.TranslateIntExpToBDD(model);
//Get the array range
int min = model.GetArrayRange(this.Argument1.ExpressionID)[0];
int max = model.GetArrayRange(this.Argument1.ExpressionID)[1];
ExpressionBDDEncoding result = new ExpressionBDDEncoding();
//a[i]
for (int i = min; i <= max; i++)
{
for(int j = 0; j < indexBddEncoding.Count(); j++)
{
//index = i & guard of index
CUDD.Ref(indexBddEncoding.ExpressionDDs[j], indexBddEncoding.GuardDDs[j]);
CUDDNode guard = CUDD.Function.And(CUDD.Function.Equal(indexBddEncoding.ExpressionDDs[j], CUDD.Constant(i)),
indexBddEncoding.GuardDDs[j]);
if(guard != CUDD.ZERO)
{
//a[i]
result.GuardDDs.Add(guard);
Expression arrayExpression;
if(Operator == ARRAY)
{
arrayExpression = new Variable(this.Argument1.ExpressionID + Model.NAME_SEPERATOR + i);
}
else
{
arrayExpression = new VariablePrime(this.Argument1.ExpressionID + Model.NAME_SEPERATOR + i);
}
result.ExpressionDDs.Add(arrayExpression.TranslateIntExpToBDD(model).ExpressionDDs[0]);
}
else
{
CUDD.Deref(guard);
}
}
}
//dereference later because 2 loops above
indexBddEncoding.DeRef();
return result;
}
