/*uses the Manager to build an identity between primed and unprimed instance of each variable
* in VariableIDs */
public static Bdd BuildIdentityOverVariableIDs(BddManager Manager, int[] VariableIDs)
{
Bdd identity = null;
if (VariableIDs.Length > 0)
{
identity = Manager.CreateBddOne();
Bdd xnorBdd, tempBdd;
for (int variable = 0; variable < VariableIDs.Length; variable++)
{
xnorBdd = Manager.LogicalXnor(
Manager.GetBddVariableWithID(VariableIDs[variable]),
Manager.GetBddVariableWithID(VariableIDs[variable] + 2)
);
tempBdd = identity;
identity = Manager.LogicalAnd(identity, xnorBdd);
tempBdd.FreeBdd();
xnorBdd.FreeBdd();
}
}
return(identity);
}
public static void BuildDeciderTransfers(CommonAST decider, BddManager Manager,
Dictionary <string, int> LocalVarToId, Dictionary <string, int> GlobalVarToId,
out Bdd TransferTrue, out Bdd TransferFalse)
{
Bdd identity = BuildIdentityTransfer(Manager, LocalVarToId, GlobalVarToId);
Debug.Assert(decider.Type == BoolParserTokenTypes.DECIDER);
CommonAST walker = decider.getFirstChild() as CommonAST;
if (walker.Type == BoolParserTokenTypes.QMARK)
{
TransferTrue = identity;
TransferFalse = identity;
}
else
{
Debug.Assert(walker.Type == BoolParserTokenTypes.EXPR);
Bdd expr = ExprToBdd(walker, Manager, LocalVarToId, GlobalVarToId);
TransferTrue = Manager.LogicalAnd(Manager.LogicalXnor(expr, Manager.CreateBddOne()), identity);
TransferFalse = Manager.LogicalAnd(Manager.LogicalXnor(expr, Manager.CreateBddZero()), identity);
identity.FreeBdd();
expr.FreeBdd();
}
}
public static Bdd ExprToBdd(CommonAST Expr, BddManager Manager,
Dictionary <string, int> LocalVarNameToId, Dictionary <string, int> GlobalVarNameToId)
{
Debug.Assert(Expr.Type == BoolParserTokenTypes.EXPR);
Bdd ExprBdd = null;
CommonAST walker = (CommonAST)Expr.getFirstChild();
switch (walker.Type)
{
case BoolParserTokenTypes.EXPR:
ExprBdd = ExprToBdd(walker, Manager, LocalVarNameToId, GlobalVarNameToId);
break;
case BoolParserTokenTypes.EMARK:
walker = (CommonAST)walker.getNextSibling();
Bdd tempBdd = ExprToBdd(walker, Manager, LocalVarNameToId, GlobalVarNameToId);
ExprBdd = Manager.LogicalNot(tempBdd);
tempBdd.FreeBdd();
break;
case BoolParserTokenTypes.ID:
int VariableID;
if (!LocalVarNameToId.TryGetValue(walker.getText(), out VariableID))
{
if (!GlobalVarNameToId.TryGetValue(walker.getText(), out VariableID))
{
Debug.Assert(false); //Varijabla mora biti ili medju lokalnim ili medju globalnim
}
}
ExprBdd = Manager.GetBddVariableWithID(VariableID);
break;
case BoolParserTokenTypes.CONST:
if (walker.getText() == "1")
{
ExprBdd = Manager.CreateBddOne();
}
else
{
ExprBdd = Manager.CreateBddZero();
}
break;
default:
Debug.Assert(false);
break;
}
if ((walker.getNextSibling() != null) &&
((walker = (CommonAST)walker.getNextSibling()).Type == BoolParserTokenTypes.BINOP))
{
Bdd firstOperand = ExprBdd;
string Operation = walker.getText();
walker = (CommonAST)walker.getNextSibling();
Bdd secondOperand = ExprToBdd(walker, Manager, LocalVarNameToId, GlobalVarNameToId);
switch (Operation)
{
case ("|"):
ExprBdd = Manager.LogicalOr(firstOperand, secondOperand);
break;
case ("&"):
ExprBdd = Manager.LogicalAnd(firstOperand, secondOperand);
break;
case ("^"):
ExprBdd = Manager.LogicalXor(firstOperand, secondOperand);
break;
case ("="):
ExprBdd = Manager.LogicalXnor(firstOperand, secondOperand);
break;
case ("!="):
ExprBdd = Manager.LogicalXor(firstOperand, secondOperand);
break;
case ("=>"):
ExprBdd = Manager.LogicalImplies(firstOperand, secondOperand);
break;
default:
Debug.Assert(false);
break;
}
firstOperand.FreeBdd();
secondOperand.FreeBdd();
}
return(ExprBdd);
}
public static Bdd buildProcCallTransfer(CommonAST procCall, CFGNodeProcedure procedureCalled,
BddManager Manager, Dictionary <string, int> LocalVarToId, Dictionary <string, int> GlobalVarToId)
{
Bdd transfer = Manager.CreateBddOne();
CommonAST walkerExpr = procCall.getFirstChild().getFirstChild() as CommonAST;
CommonAST walkerFormal = procedureCalled.GetAST().getFirstChild() as CommonAST;
#region Build Bdd for FormalParameters = Call Expressions
while (walkerExpr != null)
{
Bdd expr = HelperFunctions.ExprToBdd(walkerExpr, Manager, LocalVarToId, GlobalVarToId);
int varID;
if (!procedureCalled.FormalParameters.VariablesToId.TryGetValue(walkerFormal.getText(), out varID))
{
System.Diagnostics.Debug.Assert(false);
}
Bdd formal = Manager.GetBddVariableWithID(varID + 2);
Bdd tempBdd = Manager.LogicalXnor(formal, expr);
Bdd tempBdd2 = transfer;
transfer = Manager.LogicalAnd(transfer, tempBdd);
expr.FreeBdd();
formal.FreeBdd();
tempBdd.FreeBdd();
tempBdd2.FreeBdd();
walkerExpr = walkerExpr.getNextSibling() as CommonAST;
walkerFormal = walkerFormal.getNextSibling() as CommonAST;
}
#endregion
#region And with an identity over Global variables and true Local variables(non Formals)
/* int variableCount = procedureCalled.LocalVariables.VariablesToId.Values.Count -
* procedureCalled.FormalParameters.VariablesToId.Values.Count;
* int[] variableIDs = new int[variableCount];
* int index = 0;
* Bdd identity;
* foreach (int varID in procedureCalled.LocalVariables.VariablesToId.Values)
* {
* if (!(procedureCalled.FormalParameters.VariablesToId.ContainsValue(varID)))
* {
* variableIDs[index++] = varID;
* }
* }
*
* Bdd identNewLocals = HelperFunctions.BuildIdentityOverVariableIDs(Manager, variableIDs, variableCount);*/
Bdd identGlobals = HelperFunctions.BuildIdentityTransfer(Manager, null, GlobalVarToId);
/* if (identNewLocals != null && identGlobals != null)
* {
* identity = Manager.LogicalAnd(identGlobals, identNewLocals);
* identNewLocals.FreeBdd();
* identGlobals.FreeBdd();
* }
* else if (identNewLocals != null)
* {
* identity = identNewLocals;
* }
* else
* {
* identity = identGlobals;
* }*/
Bdd identity = identGlobals;
Bdd temp = transfer;
transfer = Manager.LogicalAnd(transfer, identity);
//temp.FreeBdd();
#endregion
return(transfer);
}